A-1800 Series

Mixer Power
Amplifiers
A-1803 (30W) A-1806 (60W) A-1812 (120W)

Ideal PA solutions for mid-sized locations

combining total flexibility of use
with high-performance amplification.
 Classroom

Features and functions that add the m

Multi-purpose, multi-function mixer/power amplifiers specifically
Classroom
designed for maximum versatility and cost-effective
high-performance are ideal units for any PA requirement in
locations such as schools and offices and other intermediate size
environments. A choice of different power outputs are offered as
well as functions such as paging and dual zone coverage.
Tennis Court
Classroom

Playground

A-1803(30W) A-1806(60W) A-1812(120W)

Versatility plus Chime on input

The A-1800 Series amplifiers are distinctive for their input The Mic 1 input incorporates chime on capability when
versatility. Each has three mic inputs, three auxiliary the optional PM-660D Paging Microphone is used. Chime
inputs, an emergency input as well as a telephone paging on can also be activated for the telephone paging.
input. Paging can be initiated and the chime function can A selection of chime tones are available such as single,
also be set to automatically output to two zones. two-tone and four-tones which can either be in ascending
or descending order.
Phantom power provided
The A-1800 Series of amplifiers provide phantom power
to all connected microphones. Phantom power can
switched on or off as needed. The microphone inputs
feature a balanced configuration with XLR connectors,
allowing long cable runs without any problems.

2 Zone coverage
A-1800 Series amplifiers feature 2 speaker Equalization
zones to which broadcasts can be sent Each amplifier allows easy tonal
independently or combined as desired. adjustment of all output signals
Emergency broadcasts will be heard in with bass and treble controls.
both zones. Even when the amplifier power
is switched off, an emergency broadcast Line output
will be imitiated to both zones. A line output is useful for adding more power in a
particular zone by providing the input signal for a booster
amplifier such as the P-1812.
All Zone
Remote control
In an expanded system with the P-1812 amplifier, an
Zone 1 emergency will activate the P-1812, even if had not be
switched on to enable the broadcast.

Record output
Zone 2 The back panel includes a stereo record output for
connecting an external recorder to archive or back up
broadcasts.
most value to all-in-one PA equipment.

Typical Connections
Cassette
CD player tape player
Column speaker
Horn speaker
Box speaker
Wireless tuner

PBX
H
C
Cassette tape
recorder
(for REC)

System Expansion Option TRUNK

BOX
Microphones

Paging
Speakers Booster amplifier microphone
(controled A-1800 Amplifier) P-1812 (120W) PM-660D

Input priority override and muting

Each input can be set for priority override as well as mute. P-1812
This facilitates making emergency announcements and
messages as well as paging. Priority is in order starting 120W Power Amplifier
with emergency,
telephone paging, High priority signal on
System amplification option
Mic 1* input, When additional power amplification is required to
then aux. power more speakers in a system, the TOA P-1812
Level

Mute level Fade in

Smoothly fade out Booster Amplifier can be connected to an A-1800
Series amplifier's line out which provides an optimal
High priority signal off level and impedance to efficiently drive the P-1812.

* Mic 1 has priority by default unless switched or when the optional PM-660D
Time
Switchable input levels
Paging Microphone is used. Priority will also automatically decrease the levels To interface properly with different equipment, input
of other inputs. sensitivity can be switched between 10dB and 0dB.

Dual power supply Emergency control

A-1800 Series amplifiers can conveniently be operated on On the back panel of amplifier is a remote-in terminal
AC or on DC24V to suit installation requirements. for emergency control which sets the default output
level for the emergency input.
This can be remote-controlled via the main volume
Music On Hold (MOH) output-equipped setting control.
For adding convenient music or messages when
telephone call waiting, music from a CD or cassette
player connected to the Aux 1 input will activate MOH to
fill the silence.

P-1812 Front

P-1812 Rear
Specifications
Model A-1812 A-1806 A-1803 P-1812
Power Sourse AC mains 50/60Hz, or 24V DC (M4 screw terminal) AC mains 50/60Hz, or
Rated Output 24V DC (M4 screw terminal)
Power/Current 120W 60W 30W 120W
Consumption AC operation: 260W (rated output), AC operation: 158W (rated output), AC operation: 80W (rated output), AC operation: 258W (rated output),
110W (EN60065) 66W (EN60065) 37W (EN60065) 94W (EN60065)
24V DC operation: 7.0A (rated output). 24V DC operation: 3.8A (rated output), 24V DC operation: 2.0A (rated output) 24V DC operation: 7.0A (rated output)
Frequency Response 2.8A (EN60065) 1.6A (EN60065) 1.0A (EN60065) 2.7A (EN60065)
Distortion 50 – 20,000Hz (±3dB) 50 – 20,000Hz (±3dB)
Input Under 2% at 1kHz, rated power Under 2% at 1kHz, rated power
MIC 1: –60dB*1, 600Ω, electronically-balanced, combined type of XLR-3-31 equivalent LINE: 0dB*1/–10dB*1 (switchable),
and phone jack, DIN socket (5 pins) 10kΩ, transformer balanced,
MIC 2, 3: –60dB*1, 600Ω, electronically-balanced, combined type of XLR-3-31 equivalent and phone jack RCA pin jack
AUX 1 (MOH): –20dB*1, 10kΩ, unbalanced, RCA pin jack
AUX 2: –20dB*1, 10kΩ, unbalanced, RCA pin jack
AUX 3: –20dB*1, 10kΩ, unbalanced, combined type of XLR-3-31 and phone jack
TEL*2: –20dB*1, 10kΩ, electronically-balanced, M3 screw terminal
Output EMERGENCY: 0dB*1, 600Ω, unbalanced, M3 screw terminal
REC: 0dB*1, 600Ω, unbalanced, REC: 0dB*1, 600Ω, unbalanced, REC: 0dB*1, 600Ω, unbalanced, LINE: 0dB*1, 600Ω, unbalanced, RCA pin jack
RCA pin jack RCA pin jack RCA pin jack SPEAKER: High impedance (100V line/83Ω),
LINE 1, 2*3: 0dB*1, 600Ω, LINE 1, 2*3: 0dB*1, 600Ω, LINE 1, 2*3: 0dB*1, 600Ω, M4 screw terminal
unbalanced, RCA pin jack unbalanced, RCA pin jack unbalanced, RCA pin jack Low impedance (4 – 16Ω),
MOH: 0dB*1, 600Ω, MOH: 0dB*1, 600Ω, MOH: 0dB*1, 600Ω, M4 screw terminal
transformer balanced, transformer balanced, transformer balanced, (Both Low and High impedance terminals
M3 screw terminal M3 screw terminal M3 screw terminal cannot be used at the same time.)
SPEAKER SELECTOR: 2 zone, SPEAKER SELECTOR: 2 zone, SPEAKER SELECTOR: 2 zone,
high impedance (100V line/83Ω), high impedance (100V line/167Ω), high impedance (100V line/330Ω),
individual selector switch, individual selector switch, individual selector switch
M4 screw terminal M4 screw terminal M4 screw terminal
DIRECT SPEAKER OUT: DIRECT SPEAKER OUT: DIRECT SPEAKER OUT:
High impedance (100V line/83Ω), High impedance (100V line/167Ω), High impedance (100V line/330Ω),
M4 screw terminal M4 screw terminal M4 screw terminal
Low impedance (4 – 16Ω), Low impedance (4 – 16Ω), Low impedance (4 – 16Ω),
M4 screw terminal M4 screw terminal M4 screw terminal
Phantom Power (Both Low and High impedance terminals cannot be used at the same time.)
S/N ratio ON or OFF for each MIC 1 – 3 with switch setting —
(Band Pass: Over 100dB (Master volume: min) Over 100dB (Master volume: min)
20 – 20,000Hz) Over 76dB (Master volume: max) Over 97dB (Master volume: max,
Over 60dB (MIC 1 – 3)) INPUT LEVEL switch: 0dB)
Over 76dB (AUX 1 – 3) Over 90dB (Master volume: max,
Over 90dB (TEL) INPUT LEVEL switch: –10dB)
Tone Control Over 96dB (EMERGENCY)
Control Input Bass: ±10dB at 100Hz, Treble: ±10dB at 10kHz —
TEL: No-voltage make contact input, open voltage: 24V DC, POWER REMOTE: No-voltage make contact input,
short-circuit: under 5mA, M3 screw terminal open voltage: 24V DC, short-circuit:
EMERGENCY*4: No-voltage make contact input, open voltage: 24V DC, under 1mA, M3 screw terminal
short-circuit: under 10mA, M3 screw terminal EMERGENCY*4: No-voltage make contact input,
open voltage: 24V DC, short-circuit:
Control Output under 1mA, M3 screw terminal
Power remote: Open collector output, withstand voltage: 35V DC, —
Chime control current: under 50mA, M3 screw terminal
1-tone, 2-tone, or ascending 4-tone chime, or None selectable with switch setting —
Indicator activated at MIC 1's DIN or CONTROL TEL terminal
5 point LED output level meter, Power indicator LED, Zone indicator LED, 5 point LED output level meter,
Priority Emergency LED, TEL LED Power indicator LED
EMERGENCY: Overrides other inputs
TEL: Overrides other inputs except “EMERGENCY”, ON/OFF selectable with switch setting —
Operating Temperature MIC 1: Overrides other inputs except “EMERGENCY & TEL”, ON/OFF selectable with switch setting
Finish –10°C to +40°C –10°C to +40°C
Panel: ABS resin, black, hair line Panel: ABS resin, black, hair line
Dimensions Case: Steel plate, black Case: Steel plate, black
Weight 420 (W) x 107.7 (H) x 367 (D)mm 420 (W) x 107.7 (H) x 367 (D)mm
Accessory 12.6kg 9.4kg 8.1kg 12.2kg
Power cord x 1, Power cord x 1,
Terminal block cover x 1, Terminal block cover x 1,
Option Terminal block cover mounting screw x 2 Terminal block cover mounting screw x 2
Rack mounting bracket: MB-25B, Rack mounting bracket: MB-25B,
Volume control cover: YA-920. Volume control cover: YA-920.
Input transformer: IT-453A
Note: Distance between barriers on the above screw terminals; M3 = 7mm, M4 = 9mm
*1 0dB = 1V
*2 Can be transformer-balanced with the addition of optional IT-453A input transformer.
*3 LINE 1 and LINE 2 outputs can be interlocked with ZONE 1 and ZONE 2 speaker selectors, respectively. (This function needs internal modification.)
*4 Operation when activated can be selected from the following: Turning ON the unit's power (factory-preset) or OFF. (The OFF function needs internal modification.)

TOA Corporation
URL: www.toa.jp/
Specifications are subject to change without notice.
Printed in Japan (0307) 833-52-305-70 u