™

I NSTALLATION & O PERATION

M ANUAL

® ®

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 Dear Customer,
Congratulations on your purchase of America’s finest brand of car audio compo-
nents. At Rockford Fosgate we are committed to musical reproduction at its best,
and we are pleased you chose our product. Through years of engineering expertise,
hand craftsmanship and critical testing procedures we have created a wide range
of products that reproduce music with all the clarity and richness you deserve.

For maximum performance we recommend you have your new Rockford Fosgate
product installed by an Authorized Rockford Fosgate Dealer, as we provide
specialized training through Rockford Technical Training Institute (RTTI). Please
read your warranty and retain your receipt and original carton for possible future
use.
To add the finishing touch to your new Rockford Fosgate image order your Rockford
accessories, which include everything from T-shirts and jackets to hats and
sunglasses.

To get a free brochure on Rockford Fosgate products and Rockford accessories,

please call 1-800-669-9899 or FAX 1-602-966-3983 in the U.S. For Canada, call
Korbon Trading at 905-567-1920. For international orders FAX 001-1-602-967-
8132 or call 001-1-602-967-3565.

PRACTICE SAFE SOUND™

CONTINUOUS EXPOSURE TO SOUND PRESSURE LEVELS OVER
100dB MAY CAUSE PERMANENT HEARING LOSS. HIGH POW-
ERED AUTO SOUND SYSTEMS MAY PRODUCE SOUND PRES-
SURE LEVELS WELL OVER 130dB. USE COMMON SENSE AND
PRACTICE SAFE SOUND.

If, after reading your manual, you still have questions regarding this prod-
uct, we recommend that you see your Rockford Fosgate dealer. If you need
futher assistance, you can call us direct at 1-800-795-2385. Be sure to have
your serial number, model number and date of purchase available when
you call.

The serial number can be found on the outside of the box. Please be sure
to record it in the space provided below as your permanent record. This will
serve as verification of your factory warranty and could become useful in
recovering your product if ever stolen.

Serial Number: _________________________________________

Model Number: ___________________________________

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 TABLE OF CONTENTS
Getting Started .................................................................................. 1
EPX2 Accessory Pack ......................................................................... 1
Introduction ...................................................................................... 2
EPX2 Block Diagram .................................................................... 2
Technical Design Features ................................................................ 3
Power Supply .............................................................................. 3
Preamplifier ................................................................................. 4
Equalizer (optional) ..................................................................... 5
Electronic Crossover .................................................................... 6
Remote Data Access Terminal (RDAT) ........................................ 7
Communications Interface ........................................................... 8
Global & VDISC Features ............................................................ 8
EPX2 Design Features ........................................................................ 9
Installation Considerations .............................................................. 11
Mounting Locations ........................................................................ 12
Wiring the System ........................................................................... 12
EPX2 Basic Connections .................................................................. 14
Basic Operation .............................................................................. 17
Preamp Operation ........................................................................... 18
Equalizer Operation (optional accessory) ........................................ 20
Crossover Operation ....................................................................... 23
Global Operation ............................................................................ 26
Lock Operation ............................................................................... 30
Setup Operation .............................................................................. 31
About Operation ............................................................................. 36
Rockford Fosgate Accessories .......................................................... 37
Installing the Optional SYM-E14 ..................................................... 38
Installing the Optional SYM-E28 ..................................................... 39
Installing the Optional FG-BLT ........................................................ 41
System Diagrams ............................................................................. 42
Troubleshooting .............................................................................. 47
Specifications .................................................................................. 50
Warranty Information ...................................................................... 52

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 G E T T I N G S TA R T E D
Welcome to Rockford Fosgate! This manual is designed to provide
information for the owner, salesperson and installer. For those of
you who want quick information on how to install this product,
please refer to the Basic Connections section of the manual. Other
information can be located by using the Table of Contents. We, at
Rockford Fosgate, have worked very hard to make sure all the
information in this manual is current. But, as we are constantly
finding new ways to improve our product, this information is subject
to change without notice.

EPX2 ACCESSORY PACK

(1) Power Connector
(1) 18' Modular Cable
(1) Velcro Fastener
(4) Mounting Screws
(1) Allen Wrench 3/32"

–1–
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 INTRODUCTION
The Symmetry EPX2 is a technological derivative of Rockford Fosgate's
Symmetry system. It offers you a product that is both rich in features
and affordable.

The EPX2 has many features including a 4-way Preamplifier, fadable

3-way Crossover, and connections for an optional 14-band or 28-
band Equalizer. To fully appreciate the benefits offered by the EPX2,
it is necessary to examine each of its key components in detail.

SYMMETRY EPX2 BLOCK DIAGRAM

OUT

EQUALIZER
(optional)

CROSSOVER OUT

IN PREAMP

POWER SUPPLY AND COMMUNICATIONS

RDAT

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 T ECH NI CA L D E S IG N F E AT U R ES
◆ Power Supply
The power supply provides the fundamental voltages required for
circuit operation. In simplest terms, a power supply converts the
standard automotive 12 volts DC into the bipolar voltages required for
audio applications.

What makes the EPX2 Power Supply unique is that it utilizes a Self-
Oscillating High Voltage Switching topology. This type of design
provides a full 1,000,000 ohms of “Power Ground / Signal Ground”
isolation. Input ground isolation is the single most effective way to
prevent alternator whine from entering an autosound installation.

CONVENTIONAL SWITCHING SUPPLY

B+ IN RAIL +
RAIL –

ISOLATED SWITCHING SUPPLY

B+ IN RAIL +
RAIL –

In a self-oscillating power supply, power ground and

audio ground are completely isolated.

Reduced Radio Frequency Interference (RFI) radiation is another

benefit provided by self-oscillating power supplies. RFI “desensi-
tizes” the tuner section of your radio resulting in poor radio reception.
Self-oscillating power supplies generate significantly less RFI than
other switching power supply designs.
In addition to performance, reliability was another objective during
the design process. The EPX2 also incorporates Electrostatic Dis-
charge Protection and Reverse-Polarity Protection.
–3–
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 ◆ Preamplifier
The preamplifier section is the heart of all EPX2 signal processing
activity. It provides source selection from one of two separate input
sources, volume control covering an 80dB range, independent bass
and treble controls with ±12dB of boost or cut, and balance and fade
capabilities.

The EPX2 preamplifier has “differential inputs” to help prevent noise

problems from creeping into the audio system. A circuit that incorpo-
rates differential inputs will only amplify the difference between two
conductors or wires. In car audio, most components are connected
together with RCA patch cables. Under ideal circumstances, the
difference between the hot center conductor and the outer shields is
the musical signal. Cars are anything but ideal, however. Electrical
noise is generated by the alternator, fan motors, windshield wipers,
brake lights, etc. These noises can be inductively coupled into the
RCA patch cables. When this occurs, the noise spikes appear on both
the center conductor and its outer shield. Since differential input
circuitry amplifies only the difference between the two conductors,
the noise spikes are NOT amplified, and they are consequently
eliminated from the system.

RCA INPUT DIFFERENTIAL

OUTPUT

CENTER
CONDUCTOR

OUTER
SHIELD

Differential inputs only amplify the difference between two conductors.

Note: the noise spikes appear on both the center conductor and the outer
shield and therefore are not amplified.

To further reduce the possibility of noise, each set of RCA inputs has
its own independent audio ground. This is critically important when
dealing with systems that contain multiple source units. In every
system there should be one, and only one, point where audio ground

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 and power ground are common. This point should be established by
the source unit. When multiple source units are used, each will
establish its own common ground point, with the result being the
dreaded “ground loop.” (Ground loops are the primary cause of
engine noise in a system.) By utilizing independent input grounds, the
EPX2 preamplifier avoids ground loops.

COMMON INDEPENDENT
GROUNDS GROUNDS

The preamp also has individual solid-state input sensitivity controls

on the input circuitry. This, in conjunction with our unique on-line
level setting procedure, allows the installer to perfectly integrate the
EPX2 with the rest of the sound system. This on-line level setting
process is an industry first. The EPX2 system actually steps the installer
through the level setting procedure via the RDAT (Remote Data
Access Terminal). This process is more than just a series of instruc-
tions. The EPX2 actually adjusts itself during this maneuver to ensure
the best possible signal-to-noise ratio, while still maintaining ad-
equate signal headroom. Finally, the EPX2 is capable of producing 10
Volts RMS of output signal. This results in reduced system noise (hiss)
and maximum dynamic range.

◆ Equalizer (optional)

Equalizers (EQs) are signal processors that are used to correct or

compensate for the acoustical deficiencies inherent in most auto
sound installations. EQs are also commonly used to “tailor” the
sound of a system to the listener's own personal listening preference.
The EPX2 has the ability to integrate a 14-band or 28-band equalizer
through the use of a plug-in module.

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 Equalizer operation is exceptionally user-friendly. All adjustments are
made from the multi-function RDAT in real-time. This means that the
user can actually hear changes as they are being made. Also, all
equalizer settings are displayed both graphically and numerically on
the system's large, easy to read RDAT display. This allows the user to
instantly see exactly how much boost or cut is being applied to any
particular band.
In the past, potentiometers have been used as the control elements for
equalizers. Being the electro-mechanical devices they are, it was only
a matter of time before they became dirty or just wore out. The EPX's
equalizer utilizes state-of-the-art solid state devices as the control
elements. They don't wear out, they don't get dirty, and they'll be just
as accurate tomorrow as they are today.
The optional EQ modules feature 14 or 28 bands of adjustments to
satisfy even the most discriminating of listeners. The 14-band equal-
izer module adjusts 1/2 octave centers in the region below 1kHz, and
octave centers at 1kHz and above. The 28-band equalizer module,
commonly used in competition, allows for adjustment at 1/3 octave
centers. Left and Right channels may be calibrated independently or
simultaneously. Additionally, each band may be adjusted over a
±12dB range in exact 1dB increments.

◆ Electronic Crossover
The EPX2's active electronic crossover is, arguably, the unit's most
outstanding feature. Its primary purpose is to do to sound what a prism
does to light. That is, it splits the composite musical signal into
discrete frequency “bands.” Most loudspeakers are not capable of
efficiently reproducing the entire musical spectrum. By splitting the
music into discrete bands, individual components of the musical
signal can be routed to loudspeakers that are specifically designed to
reproduce that part of the musical spectrum.

The EPX2 features a fadable, 3-way active crossover network. Four-

teen discrete outputs are provided.
Front Left and Right All Pass (passes all frequencies)
Front Left and Right High-Pass (passes high frequencies)
Front Left and Right Bandpass (passes midrange frequencies)
Back Left and Right All Pass (passes all frequencies)
Back Left and Right High-Pass (passes high frequencies)
Back Left and Right Bandpass (passes midrange frequencies)
Constant Bass Left and Right Low-Pass (passes low frequencies)
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 The crossover points for high-pass, bandpass, and low-pass may be
adjusted independently. (All pass outputs do not have crossover
points.) The most flexible feature is that crossover point adjustments
may be made in real time. With the EPX2, crossover points can be
dynamically adjusted while listening. In addition, the user is not
limited to the handful of crossover points offered by most crossover
manufacturers. Each filter in the EPX2 can be set to 1 of 256 possible
frequencies, for a total of 72,057,594,000,000,000 (72 quadrillion)
unique crossover combinations.
All crossover points are represented both graphically and numerically
on the LCD display of the RDAT. High-Pass, Bandpass, and Low-Pass
transfer functions are realistically simulated on a calibrated logarith-
mic frequency scale. The exact crossover frequency is displayed
numerically.

The EPX2 features a fadable crossover with constant bass low-pass

outputs. It has outputs for both the Front and Rear of the system. Front
and Rear crossover settings for these outputs can be adjusted indepen-
dently. A fadable crossover allows the user to fade the system from
front to back for just the right amount of front stage / rear fill. The
constant bass low-pass outputs provide low-pass information regard-
less of the position of the fader.

◆ Remote Data Access Terminal (RDAT)

The RDAT makes the EPX2 a unique and powerful signal processor.
The RDAT is, in reality, a very powerful computer. It coordinates the
operation of the power supply, preamp, equalizer, and crossover
sections of the EPX2, so that they all work together in perfect harmony.

The RDAT also provides the all-important link with the user. To
ensure ease of operation, a menu driven software architecture was
selected for the user interface. In this type of system, options are
presented to the user on the RDAT's large 40 character by 2 line
display. To select a particular option, the user simply presses the
function key that corresponds to the desired menu selection.

The RDAT contains a 16 bit microcontroller that runs at 20mHz. It has

a program capacity of 32k bytes and an 8k byte bank of nonvolatile
storage (saves settings when disconnected from the battery). Since all
software is written in assembly language, program coding is tight and
performance is optimal.

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 ◆ Communications Interface
The communications interface provides the communications link
between the RDAT and the EPX2 unit. It accomplishes this task by
using RS-232 serial interface circuitry on all lines carrying data.
Furthermore, to maintain ground isolation, all data lines are optically
isolated from the EPX2's audio circuitry.

◆ Global and VDISC Features

The first goal of Symmetry EPX2 was to offer a great equalizer,
crossover and preamplifier all contained in one unit controlled by the
RDAT. With that goal achieved, the second goal was to make the unit
software driven allowing each of those components to interact with
one another.

After achieving the second goal the Rockford Fosgate design team
gave the EPX2 Global and VDISC features. These features work
together and are very simple to operate. The global feature allows you
to save all equalizer-crossover-preamp settings to one preset. There
are four global presets. The VDISC feature, which stands for Volume
Dependent Interactive System Control, allows you to toggle between
different global presets based on the user specified volume thresh-
olds.

–8–

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 EPX 2 D ESIGN F EATURES
Remote Data Access Terminal

LCD Display Function Keys Escape Key

*SYMMETRY*
PREAMP EQ XOVER GLOBAL LOCK

1 2 3 ESC
<

<
MUTE 4 5 6 ➥ <
<

7 8 9 0
<

<
Volume Keys Numeric Keys Enter Key Multipurpose
Keys

LCD Display: Menu selections and other vital system information are
displayed in this area.

Function Keys: The function keys are used to select options displayed
on the LCD display.

Escape Key: The ESC key is used to cancel a function or return to the
previous menu.

Volume Keys: These keys are used to control the system volume level
and mute.

Numeric Keys: These keys are used for entering numeric data.

Multipurpose These keys are used for various operations. See Basic
Keys: Operation for additional information.

Enter Key: This key is reserved for future applications.

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 EPX2 Input Section
INPUT A INPUT B GND
B+
POWER Balanced Balanced RDAT REM

Power LED: The LED gives a visual indication of the status of the
EPX2, lighting when the unit is turned on.

RCA Input Jacks: The industry standard RCA jack provides an easy
connection for signal level input. They are gold-plated
to resist the signal degradation caused by corrosion.

Balanced Line This input will allow the optional Balanced Line Trans-
Connector: mitter to be used in conjunction with the EPX2 to
provide better noise rejection. The Balanced Line
Transmitter converts standard RCA signals to balanced
line inputs.

RDAT Interface: The RJ11 connector is used to provide an easy 1 cable

hook-up for the Remote Data Access Terminals.

EPX2 Output Section

BACK FRONT

LEFT LEFT

RIGHT RIGHT
BP HP AP LP BP HP AP

BP Output: The crossover signals from these outputs are Bandpass

frequencies. The crossover frequency is adjustable
through the RDAT.
HP Output: The crossover signals from these outputs are High-Pass
frequencies. The crossover frequency is adjustable
through the RDAT.
AP Output: The signals from these outputs bypass the internal
crossover and are All-Pass (Full Range) frequencies.
LP Output: The crossover signals from these outputs are constant
Low-Pass frequencies. The crossover frequency is ad-
justable through the RDAT.
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 I N S TA L L AT I O N C O N S I D E R AT I O N S
Tools Needed
The following is a list of tools you will need for installing the EPX2.
Allen wrench 3/32" (included) Voltmeter
Wire strippers Battery post wrench
Electric hand drill w/assorted bits Wire cutters
1kHz tone recorded at “all bits high” (opt.)

This section focuses on some of the vehicle considerations for

installing your new EPX2. Checking your battery and present sound
system, as well as pre-planning your system layout and best wiring
routes will save installation time. When deciding how to lay out your
new system, be sure that each component will be easily accessible for
making adjustments.

Before beginning any installation, be sure to follow these simple rules:

1. Be sure to carefully read and understand the instructions before

attempting to install the EPX2.
2. For safety, disconnect the negative lead from the battery prior to
beginning the installation.
3. For easier assembly, we suggest you run all wires prior to
mounting your EPX2 in place.
4. Route all of the RCA cables close together and away from any
high current wires.
5. Use high quality connectors for a reliable installation and to
minimize signal or power loss.
6. Think before you drill! Be careful not to cut or drill into gas tanks,
fuel lines, brake or hydraulic lines, vacuum lines or electrical
wiring when working on any vehicle.
7. Never run wires underneath the vehicle. Running the wires
inside the vehicle provides the best protection.
8. Avoid running wires over or through sharp edges. Use rubber or
plastic grommets to protect any wires routed through metal,
especially the firewall.
9. ALWAYS protect the battery and electrical system from damage
with proper fusing. Install a fuseholder and fuse on the +12V
power wire within 18” (45.7 cm) of the battery terminal.
10. When grounding to the chassis of the vehicle, scrape all paint
from the metal to ensure a good, clean ground connection.
Grounding connections should be as short as possible and always
be connected to metal that is welded to the main body, or chassis,
of the vehicle.
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 M OUNTING L OCATIONS
The mounting location of your EPX2 main housing and RDAT will
have a great effect on the performance of your system. To provide
proper ventilation the EPX2 should be mounted vertically whenever
possible.

Trunk Mounting
Mounting the EPX2 main housing in the trunk is sufficient. Leave
adequate room for the connection of cables and be careful not to
mount the unit near any vehicle computers or sources of high voltage.
Mounting the RDAT in the trunk does not allow for convenient access
and is not recommended.

Passenger Compartment Mounting

Mounting the EPX2 main housing in the passenger compartment is an
adequate location. Leave sufficient room for the connection of cables
and be careful not to mount the unit near any vehicle computers or
sources of high voltage. Mount the RDAT in a location that provides
the user with easy access. Do not expose the RDAT to water, extreme
heat, or direct sunlight.

Engine Compartment Mounting

The Rockford Fosgate EPX2 main housing and RDAT should never be
mounted in the engine compartment. Not only will this void your
warranty but could create an embarrassing situation caused by the
ridicule from your friends.

W IR I NG TH E S Y S TEM
1. Connect the EPX2 power cable
The B+ lead should be connected to a source of non-switched 12
volts DC. Prepare the length of cable from the constant +12V by
stripping 3/8" of insulation from the end of the wire. Insert the
bared wire into the B+ terminal of the power connector and fasten
the screw. The total current consumption through this lead is
approximately 2 amps.

NOTE: The B+ cable MUST be fused 18" or less from the vehicle's
battery. Install a fuse holder, along with a 3 amp fuse, under the
hood and prepare the cable ends as stated above. Connections
should be water tight.

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 The REM input lead should be connected to the remote turn-on
or power antenna output from the source unit. Prepare the length
of cable from the source of switched voltage by stripping 3/8" of
insulation from the end of the wire. Insert the bared wire into the
REM terminal of the power connector and fasten the screw. Total
current consumption through this lead is negligible.

The GND lead should be connected to the chassis ground of the

vehicle. Prepare a length of cable (approximately 12" long) to be
used for the ground lead by stripping 3/8" of insulation from each
end. Insert one end of bared wire into the GND terminal of the
power connector and fasten the screw. Prepare the chassis ground
by scraping any paint from the metal surface and thoroughly clean
the area of all dirt and grease. Strip the other end of the wire and
attach a ring connector. Fasten the cable to the chassis using a
screw.

After all three wires are securely fastened, insert the power
connector into the EPX2 power socket.
2. Connect the RDAT to the EPX2 with the modular cable
Important! The modular cable is NOT a standard phone cable. It
is a 6 conductor non-flipped cable as opposed to the 4 conductor
flipped cable used for telephone applications. Using a standard
phone cable with the EPX2 will damage the unit and void your
warranty.
3. Connect the source inputs
Connect the front RCA outputs from the source unit to the desired
source input on the EPX2. Since fade functions take place in the
EPX2, only front outputs from the source unit are required.
If using the optional Balanced Line Transmitter, remove the cover
from the main housing with the supplied Allen wrench. Locate
and configure the signal input jumpers (J1, J2, J4, J5) to accept a
balanced line input. Replace the cover on the main housing and
connect the RCAs from the source unit to the BLT input. Attach the
mini-DIN cable to the BLT and to the desired source input on the
EPX2. For more detailed instructions refer to Page 41 of this
manual.
4. Connect the outputs
Connect the appropriate outputs from the EPX2 to the appropriate
inputs on the amplifiers.

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 5. Verify operation
Power the system up by turning on the source unit. After a few
seconds, the RDAT should display the Main Menu. Keep the
volume low until the correct crossover points are set.
6. Adjust EPX2 crossover settings
Adjust the EPX2 crossover points to the desired crossover frequen-
cies. To access the crossover functions, select XOVER from the
Main Menu. Then select the crossover section you wish to set up.

7. Adjust system levels

Go through the EPX2 level setting procedure. Select Setup from
the Main Menu and then select Levels. Follow the instructions
given on the screen.

EPX 2 B A SI C C O N N E CT IO N S
Power Connections

*SYMMETRY*
PREAMP EQ XOVER GLOBAL LOCK

1 2 3 ESC
<

<

MUTE 4 5 6 ➥ <
<

7 8 9 0
<

<

Modular
Cable

INPUT A INPUT B GND

BALANCED BALANCED B+
POWER RDAT
REM

A B

Connect to chassis
ground of vehicle.

Connect to B+
of battery with a
3 Amp fuse.

Less than 18"

– +
Connect to remote
turn-on lead of
source unit.

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 RCA & RDAT Connections

AUD CLOCK AUTO ILLUM SEL

DISC Ch DSPL P.SCN LOUD
AMFM ST LD RDM RPT TUNE
VOL PWR
D.SCN SCAN RPT RDM DIM PAUSE

1 2 3 4 5 6
® ®

*SYMMETRY*
PREAMP EQ XOVER GLOBAL LOCK

1 2 3 ESC
<

<
MUTE 4 5 6 ➥ <
<

7 8 9 0
<

<

INPUT A INPUT B GND

BALANCED BALANCED B+
POWER RDAT REM

A B

• RCAs from source 1 are connected to “INPUT A.”

• RCAs from source 2 are connected to “INPUT B.”
• RDAT with cable is connected to “RDAT” input.
• Gain is adjustable in SETUP / LEVELS menu.

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 RCA Output Connections

BACK FRONT

LEFT LEFT

RIGHT RIGHT
BP HP AP LP BP HP AP

LOW-PASS

BANDPASS

HIGH-PASS

ALL-PASS

• Low-Pass output is connected to subwoofer amplifier.

• Bandpass outputs are connected to midrange amplifier.
• High-Pass outputs are connected to tweeter amplifier.
• All-Pass outputs are connected to special applications amplifier.
• LP, BP, & HP crossover points are adjustable in XOVER.

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 B A S I C O P E R AT I O N
The RDAT provides the link with the user. To ensure ease of operation,
a menu driven software architecture was selected for the user inter-
face. In this type of system, options are presented to the user on the
RDAT's large 40 character by 2 line display. To select a particular
option, the user presses the function key that corresponds to the
desired menu selection.

Main Menu

* SYMMETRY * >
PREAMP EQ XOVER GLOBAL LOCK

The display shown above is a representation of the EPX2 main menu.

The “>” symbol located in the upper right corner of the LCD display
indicates that there are additional menu commands available. To
access these commands, press the right “>” multipurpose key. The
display will change as follows.

< * SYMMETRY *
SETUP ABOUT

To return to the previous selections, press the left “<” multipurpose

key or the ESC key.

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 P R E A M P O P E R AT I O N
Volume Control
Use the dedicated volume control keys to adjust the output level of the
EPX2. Pressing the Up arrow key increases the volume in 2dB
increments. Pressing the Down arrow key has the opposite effect.
Press the Mute key to mute the output by 20dB. Press again to Unmute
the output by the same amount.

Vol |||||||||||||||||||||||||||||||||||||||| 40
PREAMP EQ XOVER GLOBAL LOCK

The volume keys may be used at any time, however, the volume bar
graph will only be displayed at the MAIN MENU level.

Preamp Functions
To access the EPX2 preamplifier functions, select Preamp from the
main menu by pressing the function key directly below Preamp. The
following display will appear.

* PREAMP MENU *
Source Fader Tone

Source Selection
To change the EPX2 source input, select Source from the preamp
menu. The following display will appear.

The bracket < > around A indicates that input source A is currently
selected. To switch to source B, select B from the Preamp / Source
menu. To return to the previous menu, press ESC.

Preamp / Source
< A > B Name

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 P R E A M P O P E R AT I O N
Source Name
To name the source, first select which Source is to be named (A or B),
then select Name. The following will be displayed.

Use arrow keys to change source name.

[ A ] B

Use the left/right multipurpose keys to select cursor position and the
up/down multipurpose keys to select characters. Upon completion,
press the corresponding function key.

Fader Control
To adjust the EPX2 fader control, select Fader from the preamp menu.
The following display will appear.

L |||||||||||||||||||||||||||||||||||||||| R F |||||||||||||||||||||||||||||||||||||||| B
Balance Fader

To adjust the Left/Right Balance, use the left/right multipurpose keys.

To adjust the Front/Back Fader, use the up/down multipurpose keys.
To reset Balance and Fader to their default positions, press the center
multipurpose key. To return to the previous menu, press ESC.

Tone Control
To adjust the EPX2 tone controls, select Tone from the preamp menu.
The following display will appear.

– |||||||||||||||||||||||||||||||||||||||| + – |||||||||||||||||||||||||||||||||||||||| +
< 45 Hz > 15 kHz

The bracket < > around 45Hz indicates that the 45Hz tone control
is currently selected. Use the left/right multipurpose keys to switch
between the two tone controls.
Use the up/down multipurpose keys to boost or cut the currently
selected tone control. Press the center multipurpose key to set both
tone controls to their neutral (flat) positions. To return to the previous
menu, press ESC.
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 E QUALIZER O PERATION (optional accessory)

NOTE: One of the optional equalizers (SYM-E14 or SYM-E28) must

be installed prior to equalizer operation. Refer to pages 38 and 39 for
hardware installation and page 36 for software installation.
To access the EPX2 equalizer functions, select EQ from the main
menu. The following display will appear.

Eq / Load
BANK A BANK B BANK C BANK D Adjust

Load EQ Preset
To load a previously saved equalizer preset, simply select which
BANK of presets to be recalled by pressing its corresponding function
key. After selecting which Bank of presets to load, the following
options will be displayed.

Eq / Load
< A > B C D Adjust

To select the Preset to be loaded, press the corresponding function

key. For example, to load preset “A” under “BANK A”, press the
function key directly below “BANK A” and then press the function
key directly below “A.”

The bracket < > around a Bank or Preset indicates that selection is
currently selected. To load another preset, press the desired preset's
corresponding function key. To return to the previous menu, press
ESC.

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 E Q U A L I Z E R O P E R AT I O N (optional accessory)

EQ Adjust
To manually adjust the EPX2 equalizer, select EQ from the main menu
and then select Adjust from the Eq/Load menu. The following display
will appear.

Select channel to Adjust …

Left Right Both

Select Left to adjust the equalizer's left channel or Right to adjust the
equalizer's right channel. (Left and Right equalizer settings can be set
independently.) Selecting Both will allow the left and right equalizer
channels to be adjusted simultaneously. The following screen will be
displayed.

250 Hz L=R
0 dB |||||||||||||| Save

NOTE: The display shown above represents the SYM-E14 equalizer

graph.

Use the left/right multipurpose keys to select the desired band. The
currently selected band is indicated with an underscore character
“_”. The frequency of the currently selected band is displayed
numerically in the top left of the LCD display.

Use the up/down multipurpose keys to boost or cut the selected

band. The exact amount of boost or cut for the currently selected band
is displayed numerically in the lower left of the LCD display.

To set the currently selected band to “Flat”, momentarily press the

center multipurpose key. To set all equalizer bands to “Flat,” press
and hold the center multipurpose key. To return to the previous
menu, press the ESC key.

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 E Q U A L I Z E R O P E R AT I O N (optional accessory)

Save Curve / Change Name

To save the previously set EQ curve, select Save. The following
options will be displayed.

Eq / Adjust / Save
BANK A BANK B BANK C BANK D

Press the corresponding function key under the desired Bank. After
selecting which Bank will store the curve, the name of the selected
Bank can now be changed.
The underscore “–” shows cursor position. Use the left/right multi-
purpose keys to position the cursor and the up/down multipurpose
keys to select characters. After changing the name, press the corre-
sponding function key and the following will display.

Eq / Adjust / Save
A B C D

Now select the Preset that the curve is to be saved at. After selecting
which Preset will store the curve, the name of the selected Preset can
be changed. Similar to naming the Bank, use the left /right multipur-
pose keys to select cursor position and the up/down multipurpose key
to select characters.

EQUALIZER PRESET FLOW CHART

EQ
EQ1

BANK A BANK B BANK C BANK D

PRESET A PRESET A PRESET A PRESET A

PRESET B PRESET B PRESET B PRESET B
PRESET C PRESET C PRESET C PRESET C
PRESET D PRESET D PRESET D PRESET D

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 C R O S S O V E R O P E R AT I O N
To adjust the EPX2 active electronic crossover, select XOVER from the
main menu. The following options will be displayed.

* CROSSOVER MENU *
LP BP HP

Low-Pass Adjustment
To access the crossover's low-pass section, select LP from the
crossover menu. The following screen will be displayed.

F3 = 200 20 200 2K 20K

In the display above, F3 indicates the currently selected low-pass

crossover frequency in Hz. The crossover frequency is also repre-
sented graphically on a 20Hz-20kHz log scale.

To adjust the low-pass crossover point, use the left/right multipur-

pose keys. Press ESC to return to the previous menu. Changes will be
saved automatically.

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 C R O S S O V E R O P E R AT I O N
Bandpass Adjustment
To access the crossover's bandpass section, select BP from the
crossover menu. The following options will be displayed.

Xover / BP
Back Front

Select Back to adjust the crossover's back bandpass section or Front

to adjust the front bandpass section. (Front and Back crossover
settings are totally independent.) The following screen will be dis-
played.

F3 = 200 20 200 2K 20K

Lo Side

The bandpass section has two separate crossover frequency settings.

The first determines the low-side cutoff frequency and the second
determines the high-side cutoff frequency. The EPX2 allows the user
to adjust each of these crossover frequencies independently.

To adjust the low-side frequency, press the Far Left function key. The
current low-side crossover frequency will be displayed numerically
as F3 in the top left corner of the LCD display. Use the left/right
multipurpose keys to adjust the low-side crossover frequency.

To adjust the high-side frequency, press the Far Right function key.
The current high-side crossover frequency will be displayed numeri-
cally as F3 in the top left corner of the LCD display. Use the left/right
multipurpose keys to adjust the high-side crossover frequency.

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 C R O S S O V E R O P E R AT I O N
High-Pass Adjustment
To access the crossover's high-pass section, select HP from the
crossover menu. The following screen will be displayed.

Xover / HP
Back Front

Select Back to adjust the crossover's back high-pass section or Front

to adjust the front high-pass section. (Front and Back crossover
settings are totally independent.) The following screen will be dis-
played.

F3 = 200 20 200 2K 20K

In the display above, F3 indicates the currently selected high-pass

crossover frequency in Hz. The crossover frequency is also repre-
sented graphically on a 20Hz-20kHz log scale.

To adjust the high-pass crossover point, use the left/right multipur-

pose keys. Press ESC to return to the previous menu. Changes will be
saved automatically.

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 G L O B A L O P E R AT I O N
The EPX2 Global Preset functions allow the user to…

• Save all Source-EQ-Preamp-Crossover settings to

one global preset.
• Recall all system settings from one of four presets
• Automatically toggle between presets A & B with
volume control (VDISC)
• Automatically toggle between presets B & C with
volume control (VDISC)
• Automatically toggle between presets C & D with
volume control (VDISC)

To access the global preset functions, select Global from the main
menu. The following options will be displayed.

* GLOBAL PRESET MENU *

Load Save VDISC

Global Load
To load a previously saved global preset, select Load from the global
preset menu. The following options will be displayed. Next, press the
function key that corresponds to the preset you would like to load. For
example, if you would like to load global preset “A”, you would press
the function key directly below “A”.

Global Preset / Load

< A > B C D

The bracket < > around A indicates that global preset A is currently
selected. To load another preset, press the corresponding function
key. To return to the previous menu, press ESC.

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 G L O B A L O P E R AT I O N
Global Save / Change Name
To save all system settings to a global preset:
1. Select desired Source input to be used from the Preamp/Source
menu.
2. Select desired EQ curve from the EQ Bank of Presets (RTA curve,
SPL curve).
3. Select desired Tone/Fader settings from the Preamp menu.
4. Select desired Crossover settings from the XOVER menu.

Once all system settings are adjusted, select Save from the global
preset menu. The following options will be displayed.

Global Preset / Save

< A > B C D

Select the preset of the desired settings to be saved and press the
corresponding function key. The following will be displayed.

Use arrow keys to change global name

[ A ] B C D

The name of the global preset can now be changed. Use the left/right
multipurpose keys to select cursor position and the up/down multi-
purpose keys to select characters. To return to the previous menu
press ESC.

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 G L O B A L O P E R AT I O N
Global VDISC
The EPX2 has the ability to automatically switch between global
presets A & B, presets B & C, and presets C & D based on the current
EPX2 volume settings. This feature is known as Volume Dependent
Interactive System Control, or VDISC for short. The VDISC utilizes
3 thresholds for its switching process.

To enable the VDISC feature, select VDISC from the global preset
menu. The following screen will be displayed.

Global / VDISC
Engage < Bypass > Adjust

The bracket < >around Bypass indicates VDISC is currently inactive.

To enable VDISC, select Engage by pressing the corresponding
function key. To return to the previous menu, press ESC.

To adjust the VDISC thresholds, select Adjust from the Global / VDISC
menu. The following will be displayed.

VDISC |||||||||||||||||||||||||||||||||||||||| 10
< A to B > B to C C to D

NOTE: The locations of the thresholds on the volume bar graph are
user selectable.
In the display above, the solid bars in the volume scale represent the
3 VDISC thresholds. The bracket < > around A-B indicates that the
first threshold is currently selected for adjustment. The numerical
position of the threshold point is displayed to the right of the volume
scale.

To adjust the threshold point on the volume scale, use the left/right
multipurpose keys. To select another threshold for adjustment, press
its corresponding function key. Press ESC to return to the previous
menu. Changes will be saved automatically.

VDISC |||||||||||||||||||||||||||||||||||||||| 20
A to B < B to C > C to D

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 G L O B A L O P E R AT I O N
With VDISC engaged, global Preset A will be active whenever the
EPX2 volume control is set below the first threshold. Global Preset B
will be active whenever the EPX2 volume is adjusted to a level that
exceeds the first threshold point. Global Preset C will be active
whenever the EPX2 volume control is adjusted to a level that exceeds
the second threshold point. Global Preset D will be active when the
EPX2 volume control is adjusted to a level that exceeds the third
threshold point.
With VDISC, a user could set up a system with very different
characteristics depending upon the volume setting. A good example
would be the operation of a vehicle with a convertible top. The owner
could set up the VDISC according to 4 different conditions:

Preset A: City driving with top up

(Crossover points adjusted for sound quality.)
Preset B: Highway driving with top up
(EQ adjusted to compensate for road noise.)
Preset C: City driving with top down
(Tone control adjusted to compensate for wind noise.)
Preset D: Highway driving with top down
(Crossover adjusted for speaker protection due to higher
SPL & EQ adjusted to compensate for road and wind
noise.)

GLOBAL PRESET FLOW CHART

PREAMP EQ XOVER

GLOBAL

PRESET A PRESET B PRESET C PRESET D

VDISC VDISC VDISC

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 L O C K O P E R AT I O N
The EPX2 lock feature allows the user to lock access to vital system
areas. This prevents unauthorized tampering and potential system
damage.

Lock
To lock the system, select Lock from the main menu. The following
screen will be displayed.

Access Code => [ ]

Enter your 4 digit Personal Identification Number (PIN). The default

PIN number shipped with the EPX2 unit is 1234. To change PIN
numbers see SETUP. After entering the fourth digit, the following
display will appear.

* SYMMETRY * -LOCK- >

PREAMP EQ XOVER GLOBAL LOCK

The word –LOCK– in the upper right corner of the LCD display
indicates that the system is currently locked. Access to vital system
settings is now restricted. Furthermore, the Volume will not be
allowed to exceed the level it was at when the system was locked.

Unlock
To unlock the system, select LOCK from the main menu. Enter your
4 digit PIN number as before. After entering the fourth digit, the system
will be unlocked.

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 S E T U P O P E R AT I O N
To access the Setup Menu, select Setup from the Main Menu. The
following options will be displayed.

* SETUP MENU * >

Chirp Code Language Levels Light

To access the next menu of commands, press the right “>” multipur-
pose key. The display will change as follows.

< * SETUP MENU *

Memory D-Card

Chirp
The Chirp option allows the user to enable or disable the sounds
generated by the RDAT. To access this function, select Chirp from the
Setup Menu. The following options will be displayed.

Setup / Chirp - Enable keyboard chirp?

< Yes > No

The bracket < > around Yes indicates that the chirp feature is cur-
rently active. To disable this feature, select No. The display will then
revert back to the Setup Menu.

To re-enable the chirp feature, or to change the pitch of the chirp,

select Chirp from the Setup Menu. The following options will be
displayed.

Setup / Chirp - Enable keyboard chirp?

Yes < No >

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 S E T U P O P E R AT I O N
Select Yes. The screen will then display the following.

Setup / Chirp / Pitch Control

Press UP/DN arrow keys to adjust pitch.

Press the up/down multipurpose keys to adjust the pitch of the chirp.
Pressing the center multipurpose key will reset the chirp pitch to its
factory default position. Press ESC to return to the Setup Menu.

Code
The code option allows the user to define his/her Personal Identifica-
tion Number (PIN). To access this feature, select Code from the Setup
Menu. The following screen will be displayed.

Setup / Change Access Code

Enter Old Access Code => [ ]

Enter your 4 digit Personal Identification Number (PIN). The default

PIN number shipped with the EPX2 unit is 1234. The display will
change to show the following.

Setup / Change Access Code

Enter New Access Code => [ ]

Enter your personalized 4 digit PIN number. (You choose the code.)
After entering the fourth digit, you will be asked to re-enter your new
PIN number for verification purposes. After successfully entering the
same number twice, the display will change to show the following.

Setup / Change Access Code

NEW ACCESS CODE ACCEPTED

This indicates that your new PIN number was accepted. Do not forget
your code.
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 S E T U P O P E R AT I O N
Language
This option is used to select the default language that will be displayed
on the RDAT LCD. To access this function, select Language from the
Setup Menu. The following options will be displayed.

Setup / Language - Select default

< Englsh > French German Itlian Spnish

The bracket < > around English indicates that the English language
is currently selected. To select another language to be displayed,
press the corresponding function key. To return to the previous menu,
press ESC.

Levels
This feature is used during the initial installation of your EPX2 for
proper input gain settings, maximizing noise floor, and prevent signal
clipping. To access this function, select Levels from the Setup menu.
The following screen will be displayed.

Setup / Levels - Please select method.

Assist Manual Track

The EPX2 has the ability to step the user through the level setting
procedures during the initial installation of the unit. To access this
function, select Assist from the LEVELS menu and follow the direc-
tions on the screen.

To adjust the level setting manually, select Manual. The following

screen will be displayed.

Select Source To Setup

< A > B

The bracket < > around A indicates that input source A is currently
selected. To adjust source B, select B from the Levels / Manual menu.
After selecting the source, the following screen will appear.

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 S E T U P O P E R AT I O N
> L |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 128
> R |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 128

The bracket > next to L & R indicates that the left and right channels
are currently selected for simultaneous adjustment. To increase the
left and right channel gain, use the right multipurpose key.To
decrease the left and right channel gain, use the left multipurpose
key.

The left and right Gain control may be adjusted individually by using
the up/down multipurpose keys. To adjust the Left channel gain, press
the up “^” multipurpose key.

> L |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 141

R |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 128

The bracket > next to L indicates that the left channel is currently
selected for adjustment. To increase the left channel gain, use the
right multipurpose key. To decrease the left channel gain, use the left
multipurpose key. To adjust the Right channel gain, press the down
“v” multipurpose key.

L |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 128
> R |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| 135

The bracket > next to R indicates that the right channel is currently
selected for adjustment. To increase the right channel gain, use the
right multipurpose key. To decrease the right channel gain use the
left multipurpose key.

After the Gain has been properly adjusted for both the left and right
channels, press ESC to return to the previous menu.

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 S E T U P O P E R AT I O N
To access the EQ Tracking feature select Track from the Setup/Levels
menu. The following screen will be displayed.

Setup / Levels / EQ Tracking

Engage < Bypass >

The bracket < > around Bypass indicates the EQ Tracking feature is
currently inactive. To enable EQ Tracking, select Engage by pressing
the corresponding function key.
The EQ tracking feature monitors the optional E14/E28 DCard equal-
izer to prevent signal clipping or distortion. When any frequency on
the equalizer is boosted, the overall input gain of the EPX2 automati-
cally re-adjusts itself just under clipping level.
NOTE: The levels must be adjusted prior to engaging the EQ Tracking
using Assist or Manual from The levels menu. EQ Tracking is only
beneficial when using an optional E14 or E28 DCard.
Light
This option is used to select the backlit status of the RDAT.

Setup / Light: Select backlight status.

< On > Off Auto

The bracket < > around “On” indicates that the illumination feature
is currently active. To disable this feature, select “Off”. Temporary
illumination can be enabled by selecting “Auto”. Within a 1 minute
time frame, if no keys are touched, the illumination will turn off.

Memory
This option is used to reset all system presets to their default factory
settings. To access this function, select Memory from the Setup Menu.
The following options will be displayed.

Restore presets to factory defaults?

Yes < No >

Select Yes to reset all system presets. Select No or ESC to cancel and
return to the Setup Menu.
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 DCard
This option is used to adapt the software when installing or un-
installing optional DCard modules into the EPX2 main housing. To
adapt DCard software, select D-Card from the Setup menu. The
following will be displayed.

Setup / D-Card: Select options.

E14 [ * ] E28 [ ]

The asterisk * inside the E14 brackets [ ] indicates that the E14
software is currently installed and adapted. If installing an E28
equalization module, select E28 by pressing the corresponding
function key.

When un-installing optional modules in the EPX2 main housing, the

DCard software may be disabled by pressing the corresponding
function key again. The asterisk will then be removed from the
brackets. To return to the previous menu, press ESC.

A BOUT O PERATION
The About function displays the software version currently installed
in the RDAT. Since the EPX2 is software controlled, the program can
easily be updated as new features are developed. To access this
function, select About from the Main Menu. The following will be
displayed.

*SYMMETRY*
was created by WAYNE HARRIS

A few moments later the screen will automatically change to the

following.

*SYMMETRY*
EPX BIOS: __•_____

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 ROCKFORD FOSGATE ACCESSORIES
The following accessories were designed to enhance the perfor-
mance of the EPX2 and are available from your Authorized Rockford
Fosgate Dealer.

• 14-Band Graphic Equalizer (SYM-E14)

The SYM-E14 is a 14-band graphic equalizer. This analog proces-
sor adjusts frequencies centered at 30Hz, 45Hz, 60Hz, 90Hz,
125Hz, 180Hz, 250Hz, 375Hz, 500Hz, 1kHz, 2kHz, 4kHz, 8kHz,
and 16kHz with ±12dB of boost or cut. Equalization curves can be
adjusted independently between left and right channels and can be
saved to one of 16 namable presets.

• 28-Band Graphic Equalizer (SYM-E28)

The SYM-E28 is a 28-band (1/3 octave) graphic equalizer. This
analog processor adjusts frequencies centered at 32Hz, 40Hz,
50Hz, 63Hz, 80Hz, 100Hz, 125Hz, 160Hz, 200Hz, 250Hz,
320Hz, 400Hz, 500Hz, 630Hz, 800Hz, 1kHz, 1.25kHz, 1.6kHz,
2kHz, 2.5kHz, 3.25kHz, 4kHz, 5kHz, 6.3kHz, 8kHz, 10kHz,
12.5kHz, and 16kHz with ±12dB of boost or cut. Equalization
curves can be adjusted independently between left and right
channels and can be saved to one of 16 namable presets. Addi-
tional features include dual LED level meters. The E28 is available
for the EPX2 signal processing system.

• Balanced Line Transmitter (FG-BLT)

The Balanced Line Transmitter converts signal RCA cables from the
source unit to balanced signals. The BLT improves sound quality
in the system by eliminating noises generated by vehicle electrical
systems. The BLT is available for Rockford Fosgate products that
offer a balanced input.

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 Installing the Optional SYM-E14
B B D C
® ®

P5

B D
P3 P4

B B
A. Disconnect RDAT & Power from the main unit.
B. Remove Cover from main unit by unscrewing the six hex head
screws with the 3/32" Allen wrench supplied with the EPX2.
C. Remove 2 Jumpers on connector P5 corresponding to LOL, LRL,
LOR & LRR.
D. Remove the Top Half of the 2 Standoffs carefully by hand from
the main unit. It is not necessary to remove the top screws when
separating the standoff into its two segments.
F

E
P5
E
E E F
E E
P3 P4

E. Install E14 carefully into header connections P3, P4 and P5.

F. Replace 2 Top Standoffs, with screws intact, carefully by hand.
(Do Not Overtighten.)
G. Replace Cover on the main unit with the six hex head screws.
H. Reconnect RDAT & Power to main unit.
I. Adapt E14 Software by selecting DCard from the Setup menu and
select E14 or refer to page 36 of your EPX2 Manual.
J. Congratulations! You have successfully installed your optional
Equalizer Module.
ATTENTION: To maintain your EPX2 warranty, we recommend your
Authorized Rockford Fosgate Dealer install your new accessory.
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 Installing the Optional SYM-E28

B B D C
® ®

P5

B D
P3 P4

B B

A. Disconnect RDAT & Power from the EPX2.

B. Remove Cover from main unit by unscrewing the six hex head
screws with the 3/32" Allen wrench supplied with the EPX2.
C. Remove 2 Jumpers on connector P5 corresponding to LOL, LRL,
LOR & LRR.
D. Remove 2 Nylon Screws carefully from standoffs with a slotted
screwdriver.

G
Header
Extension E F
P5

G
F F
Header
Extension E E Header
Extension

P3 P4

E. Install 3 Header Extensions supplied with EQ carefully into P3,

P4 and P5.
F. Install E28 carefully into header extensions P3, P4 and P5.
G. Replace 2 Nylon Screws carefully through EQ and secure into
standoffs with a slotted screwdriver. (Do Not Overtighten.)
H. Replace Cover on the main unit with the six hex head screws.

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 I. Reconnect RDAT & Power to main unit.
J. Adapt E28 Software by selecting DCard from the Setup menu and
select E28 or refer to page 36 of your EPX2 Manual.
K. Congratulations! You have successfully installed your optional
Equalizer Module.

ATTENTION: To maintain your EPX2 warranty, we recommend your

Authorized Rockford Fosgate Dealer install your new accessory.

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 Installing the Optional Balanced Line Transmitter

AUD CLOCK AUTO ILLUM SEL

DISC Ch DSPL P.SCN LOUD
AMFM ST LD RDM RPT TUNE
VOL PWR
D.SCN SCAN RPT RDM DIM PAUSE

1 2 3 4 5 6
® ®

Internal Jumper
Configuration
J1 J2
BLT
RCA J3
(Optional)

GND
A

BAL
RCA
*SYMMETRY*

GND
PREAMP EQ XOVER GLOBAL LOCK
B
J6
1 2 3 ESC
BAL
<

<
MUTE 4 5 6 ➥ <
<

J4 J5
7 8 9 0
<

<
A: Balanced Line Input
B: RCA Input

INPUT A INPUT B GND

B+
POWER Balanced Balanced RDAT REM

• Remove Cover from main unit by unscrewing the six hex head screws
with the 3/32" Allen wrench supplied with the EPX2.
• Reconfigure Jumpers J1 & J2 (Input A) or J4 & J5 (Input B) to accept
balanced line inputs (refer to drawing).
• RCAs from Source connected to Balanced Line Transmitter with
minimal cable.
• Balanced Line Cable from BLT connected to “Balanced” input.

ATTENTION: To maintain your EPX2 warranty, we recommend your Authorized

Rockford Fosgate Dealer install your new accessory.

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 3-Way System

BACK FRONT

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LEFT LEFT

RIGHT RIGHT
BP HP AP LP BP HP AP

Front
Tweeter High-Pass
Woofer
SYSTEM DIAGRAMS

20Hz -100Hz

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4kHz-20kHz

Back Front
Low-Pass Bandpass

Woofer 2-Channel
4-Channel
Amplifier
Amplifier
100Hz-4kHz

Midrange
 Fadable 3-Way System
BACK FRONT

LEFT LEFT

RIGHT RIGHT
BP HP AP LP BP HP AP

4kHz-20kHz Tweeter Tweeter Front

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High-Pass

Back
High-Pass 4kHz-20kHz

2-Channel Front
100Hz-4kHz

- 43 -
Amplifier Bandpass

4-Channel 4-Channel
Back Amplifier Amplifier
Bandpass 100Hz-4kHz

Midrange Midrange
20Hz-100Hz

Low-Pass
Woofer Woofer
 4-Way System
BACK FRONT

LEFT LEFT

RIGHT RIGHT
Mid-Bass BP HP AP LP BP HP AP

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2-Channel 2-Channel
Amplifier Amplifier Tweeters
100Hz-650Hz
4kHz-20kHz

Back
Bandpass
Front
High-Pass

- 44 -
4kHz-20kHz
2-Channel 650Hz-4kHz
Amplifier

Back
High-Pass Front
Tweeters 2-Channel Bandpass
2-Channel
Amplifier Amplifier Midrange

20Hz-100Hz

Low-Pass
Woofers
 Fadable 4-Way System BACK FRONT

LEFT LEFT

Tweeter and RIGHT RIGHT Tweeter and

Midrange BP HP AP LP BP HP AP Midrange
4kHz-20kHz 4kHz-20kHz

Back Front
High-Pass High-Pass

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4-Channel 4-Channel
275Hz-4kHz 275Hz-4kHz
Amplifier Amplifier

Back Front
Bandpass 2-Channel 2-Channel Bandpass
Amplifier Amplifier

100Hz-275Hz 100Hz-275Hz

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LP* LP*

2-Channel 2-Channel Mid-Bass

Mid-Bass Amplifier* Amplifier*
20Hz-100Hz 20Hz-100Hz

AP AP

*Utilize internal amplifier crossover

Woofer Woofer
 3-Way with Center Channel
BACK FRONT

LEFT LEFT

RIGHT RIGHT
BP HP AP LP BP HP AP

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100Hz-4kHz Midrange 2-Channel 2-Channel
Amplifier Amplifier
Tweeter
4kHz-20kHz
Front Bandpass *

4kHz-20kHz
*
Front High-Pass

Tweeter 2-Channel Midrange

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Front High-Pass Amplifier

100Hz-4kHz

Front Bandpass
* Use a sum adaptor to sum the left and right channels of the EPX2 into the
amplifier. Use F/R Fader to adjust the level of the center channel. 2-Channel
Amplifier**
** Internal crossover used as sub-sonic filter.
Woofer 25Hz-100Hz

Low-Pass
 TROUBLESHOOTING

Symptom Diagnosis Remedy

Unit does not Voltage applied to the Check the alternator, bat-
turn on REM terminal is not be- tery, fuse, and wiring and
(Power LED is off) tween 10.5 and 15.5 repair as necessary. If the
volts or there is no volt- voltage is above 15.5 volts,
age present. have the electrical system
inspected by an authorized
car service center.

Voltage to the B+ termi- Check the alternator, bat-

nal is not between 10.5 tery, fuse, and wiring and
and 15.5 volts or there repair as necessary. If the
is no voltage present. voltage is above 15.5 volts,
have the electrical system
inspected by an authorized
car service center.

EPX 2 is not properly Check wiring and repair as

grounded. necessary.

EPX2 has no sound Source is not properly Check Preamp Source and
(Power LED is on) selected. select the corresponding
source input.

Signal from source is not Check connections, substi-

connected or function- tute with known working
ing properly. source and cables and repair
or replace as necessary.

When using the BLT, Check connections, substi-

Balanced Line Input tute with known working BLT
from BLT is not con- and cables and repair or re-
nected or not function- place as necessary.
ing properly.

Keyboard doesn't RDAT is not processing Make sure no keys are

respond properly information correctly. depressed on the RDAT.

RDAT cable is not fully Check cable connection and

connected. correct if necessary.

Microprocessor is Disconnct power to the EPX2,

scrambled. then reconnect.

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 TROUBLESHOOTING
Symptom Diagnosis Remedy
New software Microprocessor is Reset memory using
doesn't function scrambled. Memory from the Setup
correctly menu.

Feature not Software not configured Select DCard option from

available correctly. the setup menu

High noise floor Input gain for EPX2 is set Readjust input gain of the
or “System Hiss” too low. EPX2 using Levels from the
Setup menu.

Low output from RCA/Balanced input Check signal input jumpers

EPX2. jumpers are not selected (J1, J2 & J4, J5) and correct as
for corresponding input. necessary.

High noise floor Source unit output level Source Manual

or low output is not properly matched Output Setting
when using with the EPX2. 1.0 V 200
Manual from the 1.5 V 180
Levels menu 2.0 V 164
2.25 V 157
2.5 V 150
2.75 V 145
3.0 V 139
3.25 V 134
3.5 V 129
3.75 V 125
4.0 V 120

- 48 -
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 TROUBLESHOOTING
Symptom Diagnosis Remedy
Noise in system EPX 2 is not properly Check wiring and repair as
(Alternator whine) grounded. necessary.

The simultaneous con- Remove cover from the EPX2

nection of 2 source units main housing and locate
is causing a ground loop. grounding jumpers J3 & J6.
Remove one of the jumpers
while listening to the sys-
tem. If the noise is gone,
push the jumper back onto
one of the pins for storage.
NOTE: One jumper should
always be connected when
using two source units. Both
jumpers should be con-
nected when using one
source unit.

Noise is entering through Remove the cover from the

the system via a possible EPX2 main housing and lo-
ground loop. cate the jumper labeled
DGND and AGND next to
the transformer (round do-
nut with wires). This jumper
Jumper Placement applies ground to the chassis
Diagrams of the EPX2. There are three
possible connections.
DGND •
• A. No jumper - No ground
A. Chass
AGND • applied to the chassis

DGND • B. DGND - Power supply

B. Chass • ground applied to chassis
AGND •
C. AGND - RCA shield ap-
DGND • plied to chassis
C. Chass •
AGND • Experiment with these
jumper configuration options
until a reduction in noise is
observed.

- 49 -
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 S P E C I F I C AT I O N S
Power Supply
Input Voltage 10-16 Volts DC
Input Current <2.5 amps
Ground Isolation 1 Meg Ohm
Switching Frequency 30kHz
Rail Voltages ±5 VDC, ±15 VDC
Fuse Internal - AGC 3 amp

Preamplifier
Frequency Response 20Hz-20kHz ±0.5dB
Signal-to-Noise Ratio 94dB @ 1kHz ref. 1 Volt
THD + Noise <0.05% @ 1kHz ref. 1 Volt
Input Voltage Adjustable 500 mV - 4 V RMS
Output Voltage (AP) 10 Volts RMS maximum
Sources 2 (RCA or Balanced)
Volume Control Range 80dB in 2dB increments
Mute 20dB fixed
Balance Control Range 40dB in 2dB increments
Fader Control Range 40dB in 2dB increments
Bass Control ±12dB at 45Hz
Treble Control ±12dB at 15kHz

E14 Equalizer (Optional)

Number of Bands 14
Half Octave Centers 30, 45, 60, 90, 125, 180, 250, 375, 500Hz
Octave Center 1k, 2k, 4k, 8k, 16kHz
Adjustment Range ±12dB in 1dB increments
Presets 20 total (16 normal, 4 VDISC)

E28 Equalizer (Optional)

Number of Bands 28
1/3 Octave Centers 32, 40, 50, 63, 80, 100, 125, 160, 200, 250,
320, 400, 500, 630, 800Hz, 1.0k, 1.25k, 1.6k,
2.0k, 2.5k, 3.25k, 4.0k, 5.0k, 6.3k, 8.0k, 10.0k,
12.5k, 16.0k
Adjustment Range ±12dB in 1dB increments
Presets 20 total (16 normal, 4 VDISC)

- 50 -
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 S P E C I F I C AT I O N S
Crossover
Type Fadable 3-way
Number of Outputs 10
Pass Band Information
Front L/R High-Pass 182Hz to >20,000Hz
Front L/R Bandpass
Low Side 58Hz to 7,500Hz
High Side 182Hz to >20,000Hz
L/R Low-Pass 58Hz to 7,500Hz
Rear L/R High-Pass 182Hz to >20,000Hz
Rear L/R Bandpass
Low Side 58Hz to 7,500Hz
High Side 182Hz to >20,000Hz
Crossover Points per Filter 256
Unique Crossover Settings 72,057,594,000,000,000
Output Voltage (HP, BP, LP) 10 Volts RMS maximum
Filter Topology Equal Component Sallen Key
Filter Type Butterworth
Rolloff Rate 12dB/octave

Remote Data Access Terminal

Microcontroller 16 bit High Performance
Clock Speed 19.66mHz
Program Memory 32k bytes
Non Volatile Retention >10 years
Non Volatile Endurance >10,000 write operations
Display 40 character x 2 line LCD

Dimensions
EPX Housing 6.88"W x 2.25"H x 8.14"D
RDAT 7.00"W x 2.88"H x .88"D

- 51 -
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 W A R R A N T Y I N F O R M AT I O N
Rockford Corporation offers a limited warranty on Rockford Fosgate products on the
following terms:
• Length of Warranty
3 years on electronics 90 days on electronic B-stock (receipt required)
2 years on source units 30 days on speaker B-stock (receipt required)
• What is Covered
This warranty applies only to Rockford Fosgate products sold to consumers by
Authorized Rockford Fosgate Dealers in the United States of America or its
possessions. Product purchased by consumers from an Authorized Rockford
Fosgate Dealer in another country are covered only by that country’s Distributor
and not by Rockford Corporation.
• Who is Covered
This warranty covers only the original purchaser of Rockford product purchased
from an Authorized Rockford Fosgate Dealer in the United States. In order to
receive service, the purchaser must provide Rockford with a copy of the receipt
stating the customer name, dealer name, product purchased and date of purchase.
• Products found to be defective during the warranty period will be repaired or
replaced (with a product deemed to be equivalent) at Rockford's discretion.
• What is Not Covered
1. Damage caused by accident, abuse, improper operations, water, theft
2. Any cost or expense related to the removal or reinstallation of product
3. Service performed by anyone other than Rockford or an Authorized Rockford
Fosgate Service Center
4. Any product which has had the serial number defaced, altered, or removed
5. Subsequent damage to other components
6. Any product purchased outside the U.S.
7. Any product not purchased from an Authorized Rockford Fosgate Dealer
• Limit on Implied Warranties
Any implied warranties including warranties of fitness for use and merchantability
are limited in duration to the period of the express warranty set forth above. Some
states do not allow limitations on the length of an implied warranty, so this
limitation may not apply. No person is authorized to assume for Rockford Fosgate
any other liability in connection with the sale of the product.
• How to Obtain Service
Please call 1-800-669-9899 for Rockford Customer Service. You must obtain an
RA# (Return Authorization number) to return any product to Rockford Fosgate. You
are responsible for shipment of product to Rockford.
Ship to:
Electronics
Rockford Corporation
Warranty Repair Department
2055 E. 5th Street
Tempe, AZ 85281
RA#:_________________

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 Rockford Corporation
546 South Rockford Drive
Tempe, Arizona 85281 U.S.A.
In U.S.A., (602) 967-3565
In Europe, Fax (49) 4207-801250
In Japan, Fax (81) 559-79-1265

MAN-0882-C
© 5/97

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