Powered Studio Monitors

OWNER’S MANUAL
MR524 • MR624 • MR824 Powered Studio Monitors Important Safety Instructions
1. Read these instructions. 17. Warning: This apparatus has been designed with Class I construction and must
be connected to a mains socket outlet with a protective earthing connection
2. Keep these instructions. (the third grounding prong).
3. Heed all warnings. 18. This apparatus has been equipped with a rocker-style AC mains power switch.
4. Follow all instructions. This switch is located on the rear panel and should remain readily accessible
to the user.
5. Do not use this apparatus near water.
19. The MAINS plug or an appliance coupler is used as the disconnect device,
6. Clean only with a dry cloth. so the disconnect device shall remain readily operable.
7. Do not block any ventilation openings. Minimum distance (5 cm) around the 20. The use of apparatus is in moderate climates.
apparatus for sufficient ventilation. The ventilation should not be impeded
by covering the ventilation openings with items, such as newspapers, table- 21. NOTE: This equipment has been tested and found to comply with the limits
cloths, curtains, etc. Install in accordance with the manufacturer’s instructions. for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against harmful interference
8. Do not install near any heat sources such as radiators, heat registers, stoves, in a residential installation. This equipment generates, uses, and can radiate
or other apparatus (including amplifiers) that produce heat. No naked flame radio frequency energy and, if not installed and used in accordance with
sources, such as lighted candles, should be placed on the apparatus. the instructions, may cause harmful interference to radio communications.
9. Do not defeat the safety purpose of the polarized or grounding-type plug. However, there is no guarantee that interference will not occur in a particular
A polarized plug has two blades with one wider than the other. A grounding- installation. If this equipment does cause harmful interference to radio or
type plug has two blades and a third grounding prong. The wide blade or the television reception, which can be determined by turning the equipment off
third prong are provided for your safety. If the provided plug does not fit into and on, the user is encouraged to try to correct the interference by one or
your outlet, consult an electrician for replacement of the obsolete outlet. more of the following measures:
10. Protect the power cord from being walked on or pinched particularly at plugs, • Reorient or relocate the receiving antenna.
convenience receptacles, and the point where they exit from the apparatus. • Increase the separation between the equipment and the receiver.
• Connect the equipment into an outlet on a circuit different from that
11. Only use attachments/accessories specified by the manufacturer. to which the receiver is connected.
12. Use only with a cart, stand, tripod, bracket, or table PORTABLE CART • Consult the dealer or an experienced radio/TV technician for help.
specified by the manufacturer, or sold with the WARNING CAUTION: Changes or modifications to this device not expressly approved
apparatus. When a cart is used, use caution when by LOUD Technologies Inc. could void the user's authority to operate the
moving the cart/apparatus combination to avoid injury equipment under FCC rules.
from tip-over. 22. This apparatus does not exceed the Class A/Class B (whichever is appli-
13. Unplug this apparatus during lightning storms or when cable) limits for radio noise emissions from digital apparatus as set out in the
unused for long periods of time. radio interference regulations of the Canadian Department of Communications.
14. Refer all servicing to qualified service personnel. Servicing is required when ATTENTION — Le présent appareil numérique n’émet pas de bruits radioélec-
the apparatus has been damaged in any way, such as power-supply cord triques dépassant las limites applicables aux appareils numériques de class
or plug is damaged, liquid has been spilled or objects have fallen into the A/de class B (selon le cas) prescrites dans le réglement sur le brouillage
apparatus, the apparatus has been exposed to rain or moisture, does not radioélectrique édicté par les ministere des communications du Canada.
operate normally, or has been dropped. 23. Exposure to extremely high noise levels may cause permanent hearing loss.
15. This apparatus shall not be exposed to dripping or splashing, and no object Individuals vary considerably in susceptibility to noise-induced hearing loss,
filled with liquids, such as vases or beer glasses, shall be placed on the but nearly everyone will lose some hearing if exposed to sufficiently intense
apparatus. noise for a period of time. The U.S. Government’s Occupational Safety and
Health Administration (OSHA) has specified the permissible noise level
16. Do not overload wall outlets and extension cords as this can result in a risk exposures shown in the following chart.
of fire or electric shock.
According to OSHA, any exposure in excess of these permissible limits could
CAUTION result in some hearing loss. To ensure against potentially dangerous exposure
to high sound pressure levels, it is recommended that all persons exposed
RISK OF ELECTRIC SHOCK! DO NOT OPEN!
to equipment capable of producing high sound pressure levels use hearing
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT protectors while the equipment is in operation. Ear plugs or protectors in the
REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS INSIDE. ear canals or over the ears must be worn when operating the equipment in
REFER SERVICING TO QUALIFIED PERSONNEL. order to prevent permanent hearing loss if exposure is in excess of the limits
The lightning flash with arrowhead symbol within set forth here:
an equilateral triangle is intended to alert the user Duration, per Sound Level dBA, Typical Example
to the prescence of uninsulated “dangerous voltage”
within the product’s enclosure, that may be of significant ma- day in hours Slow Response
gnitude to constitute a risk of electric shock to persons. 8 90 Duo in small club
The exclamation point within an equilateral triangle is 6 92
intended to alert the user of the prescence of important 4 95 Subway Train
operating and maintaining (servicing) instructions in the 3 97
literature accompanying the appliance. 2 100 Very loud classical music
1.5 102
Laite on liitettävä suojakoskettimilla varustettuun pistorasiaan. 1 105 Jon screaming at Troy about deadlines
0.5 110
Apparatet må tilkoples jordet stikkontakt. 0.25 or less 115 Loudest parts at a rock concert
Apparaten skall anslutas till jordat uttag. WARNING — To reduce the risk of fire or electric
shock, do not expose this apparatus to rain or moisture.
Correct disposal of this product: This symbol indicates that this product should not be disposed of with your household
waste, according to the WEEE directive (2012/19/EU) and your national law. This product should be handed over to
an authorized collection site for recycling waste electrical and electronic equipment (EEE). Improper handling of this type
of waste could have a possible negative impact on the environment and human health due to potentially hazardous substances
that are generally associated with EEE. At the same time, your cooperation in the correct disposal of this product will
contribute to the effective usage of natural resources. For more information about where you can drop off your waste
equipment for recycling, please contact your local city office, waste authority, or your household waste disposal service.

2 MR524 • MR624 • MR824 Powered Studio Monitors

Contents MR Features

Owner’s Manual
Important Safety Instructions............................................................2 • Designed for superior mix translation and accuracy
Table Of Contents..............................................................................3 for professional results in any studio

Features...........................................................................................3 • Equipped with Mackie’s proven logarithmic

waveguide design
Introduction......................................................................................4 o Ultra-wide dispersion for enhanced stereo
Quick Start.......................................................................................5 imaging and listening sweet spot
o Precise acoustic alignment offers incredibly
Hookup Diagram...............................................................................6
balanced sound across the entire frequency
Rear Panel Description .....................................................................7 spectrum
1. Power Connection And Fuse...............................................7
• 1" silk dome tweeter provides fast transient
2. Power Switch....................................................................7 response for detailed high end and vocal clarity
3. Signal Inputs.....................................................................7
• Polypropylene woofer delivers responsive,
4. Acoustic Space...................................................................8
dynamic low frequency response
5. High Frequency Filter.........................................................8 o MR524 – 5.25"
6. Input Level........................................................................8 o MR624 – 6.5"
7. Custom-Tuned Rear Port....................................................8 o MR824 – 8"
Front Panel Description.....................................................................8 • Bi-amplified Class A/B amplification
8. Front Panel LED.................................................................8 o MR524 – 50 watts
Protection Circuits.............................................................................9
o MR624 – 65 watts
o MR824 – 85 watts
Overexcursion Protection.......................................................9
Thermal Protection................................................................9 • Frequency response:
Integrated Magnetic Shielding................................................9 o MR524 – 45 Hz – 20 kHz
o MR624 – 38 Hz – 20 kHz
Input Signal Wiring................................................................9
o MR824 – 35 Hz – 20 kHz
Care And Cleaning.............................................................................9
• Optimize MR monitors for your mixing environment
Appendix A: Service Information.....................................................10 o Adjustable acoustic space filters maintain flat
Troubleshooting...................................................................10 response in typical placement configurations
Repair.................................................................................11 o HF filter applies boost or cut to compensate
for particularly dull or bright sounding rooms
Appendix B: Technical Information...................................................12
MR Specifications...................................................................12 • Professional MDF cabinet design built to last
MR Dimensions.......................................................................13 and look great in any studio
o Custom designed internal bracing adds
MR Block Diagram..................................................................14
stiffness for reduced distortion and enhanced
Limited Warranty............................................................................15 low frequency response
• Flexible inputs for simple connection to almost
any audio source
Please write your serial number here for future
reference (i.e., insurance claims, tech support, • Acoustically optimized with sound-tightening
return authorization, make dad proud, etc.) acoustic absorption material
• Add the companion MRS10 studio subwoofer
for powerful, deep low frequency extension
perfect for electronic music, hip-hop and more
Purchased at:

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Part No. SW1198 Rev. A 06/17
©2017 LOUD Technologies Inc. All Rights Reserved. Watch our dang videos
Owner’s Manual 3
 Introduction Designed To Enhance Your Sonic
MR524 • MR624 • MR824 Powered Studio Monitors
Experience
MR Series Powered Studio Monitors offer professional
performance, clarity and superior mix translation so you The ability to reveal the character of your music
can listen with confidence knowing your mix will sound is the number one reason to get professional studio
great anywhere. monitors. MR monitors are packed with design features
to enhance this experience. From the added punch
Drawing from Mackie’s extensive studio monitor and bass extension provided by the custom-tuned ports
design experience, MR Series monitors are precision to the rugged cabinet packed with sound-tightening
tuned to stay true to your mix whether it’s dialogue, acoustic absorption material, you can be confident
hip hop, rock and beyond. that MR monitors are revealing the full-range, natural
Our proven logarithmic waveguide provides an character that your music deserves.
ultra-wide listening sweet spot and enhanced stereo
imaging while the Acoustic Space controls allow you As Versatile As Your Application
to adjust the frequency response of the monitor to match
your studio. Add the MRS10 Powered Studio Subwoofer All studio spaces are different. As such, having the
for powerful, deep low-end. right connection types and customizable control over
your acoustics is necessary.
A Brief History Of Time... That’s why MR monitors include acoustic controls
for dialing in the specific sound needed for your space.
We have been designing and re-designing studio And you can boost / cut the highs to get exactly the
monitors for nearly 20 years. Our talented engineering amount of sizzle and shimmer you desire.
team has now designed monitors that love music
as much as you do. Targeted at music lovers and What’s more, three types of input connectors
post-production studios alike, the new MR are provided [XLR, 1/4" and RCA] to interface
Series Powered Studio Monitors have been re-voiced with virtually any application you may have.
and re-kitted, offering unparalleled clarity and Your studio deserves a professional monitoring system
unbelievable depth for today’s demanding home with the flexibility and performance to up the level of
project or post-production studio requirements. your music production.

Music Is All That Matters A Variety Of Applications...

When designing the MR Powered Studio Monitors, MR Series Powered Studio Monitors may be used in a
we didn’t start on paper. Instead, we poured through variety of applications. Some examples include:
countless hours of music from every possible genre
and source. Next, we focused on acoustic optimization • Home and project studios – Music production for
with things like our minimum-diffraction waveguide solo artists, small bands and DJs. Post-production edit/
that delivers unmatched clarity and an open feel mix suites, recording, editing, mixdown, mastering of
that instantly connects you to the music. From everything from spoken word performances to full music
perfectly optimized electronics to amps and drivers productions.
custom-matched for performance, MR monitors
• A/V broadcast studios – Live broadcast/streaming
are designed for your music.
of audio-only or AV content such as radio and TV.
Production/Post-production focused on podcasts
or other streaming audio. Voiceovers, too.
• Video post-production – Edit suites for small
productions such as commercials, budget films
or multimedia for internet broadcast, etc.
• Home theater and other multimedia – Music
and movie playback, video game sound system,
social function/party system, etc.

4 MR524 • MR624 • MR824 Powered Studio Monitors

Quick Start An Extremely Important Note

Owner’s Manual
We realize that you can’t wait to hook up your MR on MR Bass Response and Your
Studio Monitors and try them out. Nevertheless, please
take the time to read this page NOW, and the rest can
Control Room
wait until you’re good and ready. MRs achieve the best bass ­response in a
room that’s optimized for bass r­ eproduction.
A lot of factors can conspire to thwart the
1. Turn the input level control on the back of the cabinet MR’s extended low frequency – including room shape,
down (fully counterclockwise) before turning on the room volume and ­acoustical treatment.
monitor for the first time.
This is not a cop-out or an apology. It’s plain old
physics in action. Luckily we’ve armed you with some
2. Set the power switch on the back panel off. This will compensating controls that you can use to optimize the
prevent you from accidentally connecting a hot signal frequency response of the speakers in your particular
source to the monitor and getting a rude surprise. room. Consider the following:

3. Leave the acoustic space and high freq filter switches Low-Frequency Response
at their normal positions. When you put your MRs in a corner or up against
walls, their bass characteristics change. The apparent
loudness of the low frequencies increases when the
4. Connect the line-level monitor signal from your mixer,
monitors are placed close to a wall, and even more
preamp, or other signal source to the input jack
so when they are placed in a corner.
on the MR Studio Monitor (1⁄4", XLR, or RCA).
If you have placed the monitors against the walls
5. Connect the supplied AC power cord to the IEC socket and would like to lower the bass, try setting the
on the back of the monitor. Plug the other end into acoustic space switch to the –2 dB [Half Space]
an AC outlet properly configured with the voltage position. If the monitors are in the corners, try the
corresponding to the markings next to the IEC socket. –4 dB [Quarter Space] position.

6. Start your signal source (8-track player, turntable, High-Frequency Response

CD player, DAW, or whatever), but leave the master The MRs are designed to provide a smooth
volume control on the mixer or preamp down. frequency response throughout the mid and high
range. Nevertheless, you may decide that you need
7. Turn on the power switch on the MR. The LED on a little more or a little less high frequencies in your
the front panel will illuminate. monitors while you are mixing. The high freq filter
switch provides a gentle boost or cut to the tweeter.
Remember that boosting the high frequencies in the
8. Slowly turn up the input level control on the back
monitors can result in a duller mix, while reducing
of the monitor to its fully clockwise position.
the high frequencies can result in a brighter overall mix.

9. Adjust the master volume on the mixer or preamp to

a comfortably loud listening level. If the MR gets loud
Additional Tidbits of Wisdom
really fast, turn down the input level control to its cen- • Never listen to loud music for prolonged periods.
ter position (12 o’clock) to provide more volume control Please see the Safety Instructions on page 2 for
on the mixer or preamp. information on hearing protection.
• When you shut down your equipment, turn off the MR
Enjoy the silky smooth highs and authoritative, studio monitors first to prevent thumps and
commanding lows of the MR. Then read the rest of this other noises generated by any upstream equipment from
manual. coming out the speakers. When powering up, turn on
the monitors last.
• Save the shipping box! You may need it someday.
• Save your sales receipt in a safe place. It’s your
warranty!

Owner’s Manual 5
 Hookup Diagram
MR524 • MR624 • MR824 Powered Studio Monitors

MR524, MR624, MR824 MR524, MR624, MR824

Connecting MR studio monitors is quite easy, so let’s take a quick look at a fairly typical setup.
In this example, whatever sources you desire are plugged into the Big Knob Studio’s inputs.

Next, the main L/R outputs from a Big Knob Studio are connected to the inputs of a pair
of MR studio monitors using 1/4" connectors.

Yeah, that’s all there is to it! Now that connections have been made, it’s time for playback...let’s
hear how those tunes turned out!

Typical MR Series Setup

6 MR524 • MR624 • MR824 Powered Studio Monitors

Rear Panel Description 3. Signal Inputs

Owner’s Manual
This is where the signal is connected to the monitor Connect the line-level signal from the mixer
and adjustments are made to the frequency response of (or other signal source) to one of these input jacks.
the speakers to match the monitor’s location and the There are three types of input connectors to choose
room’s environment. from: balanced XLR, balanced/unbalanced 1/4" and
unbalanced RCA. Since all three of them are connected
together electrically, do not connect more than one
7 signal at a time to the input jacks.
3 A balanced signal provides better noise rejection
and is the preferred method, especially if using a cable
longer than 20 feet (6 meters).
3 They are wired as follows, according to standards
4 5 6 specified by the AES (Audio Engineering Society):
Balanced XLR
3
Hot (+) Pin 2
Cold (–) Pin 3
Shield (Ground) Pin 1
2

2
SHIELD
HOT

COLD 3 1

1 SHIELD

1 3
2
COLD

HOT

Balanced XLR Connectors

1. Power Connection and Fuse

Balanced 1/4" TRS
Connect the power cord to this IEC socket securely,
and plug the other end into a live AC outlet. Make sure Hot (+) Tip
the AC outlet has the correct voltage indicated next to Cold (–) Ring
the IEC socket. Shield (Ground) Sleeve

Disconnecting the plug’s ground pin is RING SLEEVE SLEEVE RING TIP

dangerous. Don’t do it!

TIP

RING
TIP
The fuse is located behind the fuse cover, at the SLEEVE

bottom of the IEC socket. See the “Troubleshooting”

section on page 10 for information about replacing the Balanced 1/4" Connectors
fuse.

Unbalanced 1/4" TS
2. Power Switch
Hot (+) Tip
Press this switch left to turn the MR studio Shield Sleeve
monitor on. Make sure the level control is down
before you turn it on. When the power switch is SLEEVE SLEEVE TIP

turned on and the MR studio monitor is plugged into TIP

an AC outlet, the LED on the front panel illuminates TIP
green to let you know that it’s ready to go.
SLEEVE

Press the right side of this switch down to put

the speaker into standby mode. It will not function, Unbalanced 1/4" Connectors
but the circuits are still live. To remove AC power,
either turn off the AC supply, or unplug the power
cord from the speaker and the AC supply.
Owner’s Manual 7
 Unbalanced RCA A bit less high-frequency energy usually fixes this, and
MR524 • MR624 • MR824 Powered Studio Monitors
the mix may be forced in this direction by reducing the
Hot (+) Tip
high-frequency output of the monitors by using the –2 dB
Shield (Ground) Sleeve
position of the switch.
SLEEVE TIP SLEEVE TIP
Conversely, if the mixes are consistently too bright,
then adding some additional high-frequency energy in
the monitors satisfies your ears, and the resultant mix
has less HF content.
RCA Unbalanced Connectors
It’s a real rush to mix really loud. But remember that
4. Acoustic Space the resulting mix only sounds good when you play it at
least that loud. However strange it may sound, mixes
This is a three-way switch that a­ djusts the
made at lower levels sound even better when played
low-frequency response of the monitors to compensate
loud, perhaps even a bit bigger than life.
for their placement in the room.
Get that sound level meter out. Decide what level to
• If you use the MRs free-standing, away from walls and
mix at and use the meter to help keep mixing at that
corners (whole space [4A]), set the acoustic space
level. Your ears will thank you, and your mixes will be
switch to the “A” position (NORMAL).
better for it.
• If you place the MR monitors against a wall (half space
[4B]), set the acoustic space switch to the “B” position. 6. Input Level
This activates a shelving filter to reduce the low-fre- The MR studio monitors expect a line-level signal
quency output by 2 dB to compensate for the half-space at its input. Use this control to adjust the sensitivity
placement. of the input section according to the signal strength
• If you place the monitors into the corners of your room at its input.
(quarter space [4C]), the low-frequency output
approximately doubles from what it is in half space. Set • The MR studio monitors are designed to operate
the acoustic space switch to the “C” position to reduce with a +4 dBu signal when the input level control
the low-frequency output by 4 dB to compensate for the is in the normal (fully clockwise) position. In other
quarter-space placement. words, wide open.
• Refer to the Quick Start section on page 5 for the
level-setting procedure.

7. Custom-Tuned Rear Port

4 5 6 The custom-tuned rear port uses the radiation from
the rear of the woofer cone to extend the low-frequency
response of the speaker. The size of the port is carefully
designed with respect to the volume of the cabinet
and the characteristics of the woofer to produce
low-frequency extension.

Front Panel Description

5. High Frequency Filter
8. Front Panel LED
This switch tailors the high-frequency response
by ±2 dB at 3 kHz and above on all three MR models. This LED will illuminate solid green to indicate
that signal is present in the MR studio monitor.
Leave this switch in the “0 (NORMAL)” position
unless:
• You want to subtly brighten or darken the sound of the
speakers.
• Perhaps you have hearing loss caused by too many
nights in front of a Marshall full stack. 8
• You just like to mix on the bright side or dull side.
If the mixes consistently sound dull or dark when
you listen elsewhere, this usually indicates that the
monitors are too bright, relative to your normal hearing.

8 MR524 • MR624 • MR824 Powered Studio Monitors

Protection Circuits

Owner’s Manual
There are several protection mechanisms designed
into the MR studio monitors to safeguard the
Input Signal Wiring
speakers and amplifiers from inadvertent damage. We recommend using high-quality, shielded cables
CAUTION: The protection circuits to connect the signal source to the signal input jack
are designed to prevent damage to the on MR studio monitors.
speakers under reasonable and sensible Three types of input connectors are provided to
conditions. Should you choose to ignore the warning interface with virtually any application you may have:
signs (i.e., excessive distortion), you can still damage
the speakers in the MR studio monitors by overdriving • Balanced microphone cables work well with the
them. Such damage is beyond the scope of the warranty. XLR input.
• Balanced (TRS) / unbalanced (TS) cables work well
with the 1/4" input.
Overexcursion Protection
• Unbalanced phono cables work well with the RCA
A 12 dB/octave high-pass filter below port tuning input.
just prior to the low-frequency amplifier prevents
very low frequencies from being amplified. Excessive
NOTE: Route the cable away from AC power cords
low-frequency energy below the usable frequency range
and outlets. These are common sources for hum in an
can damage the woofer by causing it to “bottom out,”
audio signal. Wall warts and line lumps are especially
also known as overexcursion, which is equivalent
insidious hum inducers!
to a mechanical form of clipping.
NOTE: In certain home theater applications, it may
Thermal Protection be necessary to connect the speaker outputs from a
stereo receiver to the inputs of the MR studio monitors
All amplifiers produce heat. The MR studio if the receiver doesn’t have preamp outputs or other
monitors are designed to be efficient both electrically line-level output connections.
and thermally. CAUTION: Do not attempt to connect
• If for some reason the heatsink gets too hot, a speaker output directly to the input
a thermal switch activates and turns off the amplifier. of the MR studio monitor! Speaker levels
This protection operates independently for the are much higher than line levels and can damage
low-frequency and high-frequency amplifiers. the input circuitry in the MR studio monitors.
Therefore, it is possible for only the low frequency or However, it is possible to insert a speaker-level
high frequency amplifier to shut down while the other to line-level signal attenuator between the receiver’s
remains on. speaker output and the MR studio monitor’s input.
• When the heatsink cools down to a safe temperature, Any local authorized dealer should be able to assist,
the thermal switch resets and normal operation or you can build your own.
resumes.
• If the heatsink temperature again gets too hot, the
shutdown process repeats. Should this happen, make Care and Cleaning
sure that airflow to the rear of the cabinet is not
MR Reference Studio Monitors will provide many
restricted.
years of reliable service if you follow these guidelines.
Integrated Magnetic Shielding • Avoid exposing the monitors to moisture.
• Avoid exposure to extreme cold (below freezing
The MR studio monitors contain drivers with large temperatures).
magnetic structures. The drivers’ magnets are
• Use a dry cloth to clean the cabinets. Only do this when
not shielded. Unshielded speakers can cause distortion
the power is turned off.
in both the shape and color of the picture if placed
too close to a CRT (cathode ray tube). If you have a
particularly sensitive computer monitor or TV screen,
it may be necessary to move the speakers a few inches
away.

Owner’s Manual 9
 Appendix A: Service Information
If you think your MR Studio Monitor has a problem, No Sound
MR524 • MR624 • MR824 Powered Studio Monitors
please check out the following troubleshooting
• Is the power LED on the front panel illuminated?
tips and do your best to confirm the problem.
If not, refer to “No Power” to the left.
Visit the Contact Tech Support section of our
website (www.mackie.com/support) where you will • Is the input level control turned up?
find lots of useful information such as FAQs and other • Is the signal source turned up? Make sure the signal level
documentation. You may find the answer to the problem from the mixing console (or whatever device
without having to send your MR away. immediately precedes the studio monitor) is high
enough to produce sound.
Troubleshooting • If it’s a stereo pair, try switching them around. For
example, if a left output is presumed dead, switch the
No Power left and right cords at the monitor end. If the problem
• Our favorite question: Is it plugged in? switches sides, it’s not the monitor. It could be a bad
cable, or no signal from the mixer.
• Make sure the power cord is securely seated in the IEC
socket and plugged all the way into the AC outlet.
Bad Sound
• Make sure the AC outlet is live (check with a tester
or lamp). • Is the input connector plugged completely into the jack?
• Is the power switch on the rear panel in the ON If using a 1⁄4" plug, make sure it is plugged all the way in.
position? • Is it loud and distorted? Reduce the signal level at the
• Is the power LED on the front panel illuminated? mixer.
If not, make sure the AC outlet is live. If so, refer to • If possible, listen to the signal source with headphones
“No Sound” to the right. plugged into the preamp stage. If it sounds bad there,
• If the power indicator is not illuminated, and you are it’s not the monitor.
certain that the AC outlet is live, it is possible the fuse • Too much bass or not enough bass? Move around the
has blown. room and see if the bass response changes. It’s possible
To remove and replace the fuse: your listening position coincides with a room mode
where the low frequencies either become exaggerated
1. Disconnect the power cord from the IEC socket.
or nulled. If so, try moving the monitors to a different
2. Remove the fuse drawer by prying it open with a position, or moving your listening position.
small screwdriver. It will slide all the way out.
Noise/Hum/Buzz
• Check the signal cable between the mixer and the
monitor. Make sure all connections are secure. These
problems usually produce crackling noises, hum, or buzz.
• If connecting an unbalanced output to the MR
studio monitor’s balanced input, make sure the shield
is connected to the unbalanced ground of the source
and to pins 1 and 3 of the XLR.
FUSE • If a CATV cable is connected to the system, try
disconnecting it. If the hum goes away, call your cable
carrier to check for proper grounding of the cable.
3. Remove the fuse and replace it with an
• Make sure the signal cable is not routed near AC cables,
equivalent-type fuse.
power transformers, or other EMI sources (including
115 VAC: T 1 AL / 250 V wall warts and line lumps!). These sources usually
230 VAC: T 500 mAL / 250 V [MR524] produce hum.
• Is there a light dimmer or other triac-based device on
115 VAC: T 1.6 AL / 250 V
the same AC circuit as the monitor? Dimmers cause
230 VAC: T 800 mAL / 250 V [MR624]
buzzing noises. Use an AC line filter or plug the monitor
115 VAC: T 2 AL / 250 V into a different AC circuit.
230 VAC: T 1 AL / 250 V [MR824] • Excessive hiss is an indication of an incorrect gain
4. Replace the fuse drawer by pushing it all the way setting somewhere before the speaker.
back into the IEC socket. • If possible, listen to the signal source with headphones
plugged in. If it sounds noisy there, it’s not the monitor.
If two fuses blow in a row, then something is very wrong.
See the “Repair” section on the next page to find out
how to proceed.

10 MR524 • MR624 • MR824 Powered Studio Monitors

Repair

Owner’s Manual
For warranty service, please refer to the warranty
information on page 15.
Non-warranty service is available at a factory-
authorized service center. To locate the nearest
service center, visit www.mackie.com/support/service-
locator. Service for MRs living outside the United
States may be obtained through local dealers or
distributors.
If you do not have access to our website, please call
our Tech Support department at 1-800-898-3211 (normal
business hours, Pacific Time), to explain the problem.
They will tell you where the nearest factory-authorized
service center is located in your area.

Need help with your MR Studio Monitor?

• Visit www.mackie.com/support to find: FAQs, manuals, and addendums.
• Email us at: www.mackie.com/support-contact
• Telephone 1-800-898-3211 to speak with one of our splendid technical support chaps
(Monday through Friday, normal business hours, Pacific Time).

Owner’s Manual 11
MR524 • MR624 • MR824 Powered Studio Monitors Appendix B: Technical Information
MR Specifications AC Power Requirements
Power Requirements: ~120 V, 60 Hz
Acoustic Performance ~220 V – 240 V, 50/60 Hz
Frequency Response (–3 dB): ~100 V, 50/60 Hz
57 Hz – 20 kHz [MR524] Note: MR monitors do not support multiple voltage
45 Hz – 20 kHz [MR624] configurations. Make sure the voltage rating for your
38 Hz – 20 kHz [MR824] particular model (as indicated on the rear panel near the
Frequency Response (–10 dB): IEC socket) corresponds with your local AC mains voltage.
45 Hz – 20 kHz [MR524] AC Connector: 3-pin IEC 250 VAC, 15 A male
38 Hz – 20 kHz [MR624]
35 Hz – 20 kHz [MR824] Fuse: 115 VAC: T 1 AL / 250 V
230 VAC: T 500 mAL / 250 V [MR524]
Sound Pressure Level @ 1 meter, +4 dBu into Balanced Input:
102 dB SPL @ 1m [MR524] 115 VAC: T 1.6 AL / 250 V
105 dB SPL @ 1m [MR624] 230 VAC: T 800 mAL / 250 V [MR624]
107 dB SPL @ 1m [MR824] 115 VAC: T 2 AL / 250 V
Maximum SPL Per Pair: 108 dB SPL @ 1m [MR524] 230 VAC: T 1 AL / 250 V [MR824]
111 dB SPL @ 1m [MR624] Power Consumption:
113 dB SPL @ 1m [MR824] 90 watts with music, loud mix
10 watts quiescent (idle) [MR524]
Transducers
120 watts with music, loud mix
Low Frequency: 5.25 in / 133 mm 11 watts quiescent (idle) [MR624]
polypropylene woofer [MR524]
6.5 in / 165 mm 150 watts with music, loud mix
polypropylene woofer [MR624] 12 watts quiescent (idle) [MR824]
8.0 in / 203 mm
polypropylene woofer [MR824]
High Frequency: Neodymium magnet driven
Physical Dimensions and Weight
1 in / 25 mm silk dome tweeter MR524:
Enclosure: 0.47 in / 12 mm thick MDF with
Amplifiers 0.83 in / 21 mm MDF front panel
Low Frequency Power: 30 watts, 4 Ω load, Dimensions:
60 watts peak [MR524] Height: 11.1 in / 281 mm
40 watts, 4 Ω load, Width: 7.1 in / 180 mm
80 watts peak [MR624] Depth: 8.7 in / 221 mm
55 watts, 4 Ω load, Weight: 10.2 lb / 4.6 kg
110 watts peak [MR824] MR624:
High Frequency Power: 20 watts, 6 Ω load, Enclosure: 0.47 in / 12 mm thick MDF with
40 watts peak [MR524] 0.94 in / 24 mm MDF front panel
25 watts, 6 Ω load, Dimensions:
50 watts peak [MR624] Height: 12.9 in / 328 mm
30 watts, 6 Ω load, Width: 8.3 in / 210 mm
60 watts peak [MR824] Depth: 11.2 in / 284 mm
Weight: 16.5 lb / 7.5 kg
Type: Monolithic IC, Class AB with
DMOS power stage MR824:
Enclosure: 0.59 in / 15 mm thick MDF with
Electronic Crossover 1.30 in / 33 mm MDF front panel
Crossover Type: 24 dB/octave Dimensions:
Crossover Frequency: 2 kHz [MR524] Height: 15.7 in / 400 mm
3 kHz [MR624] Width: 10.1 in / 256 mm
1.9 kHz [MR824] Depth: 12.6 in / 320 mm
Weight: 23.0 lb / 10.4 kg
Sensitivity: +4 dBu at 300 Hz for full output
Damping: Adiabatic batting [MR524/624/824]
Input Impedance: 20 kΩ, balanced bridging;
10 kΩ unbalanced
Disclaimer
Equalization
LOUD Technologies Inc. is always striving to improve
High Frequency EQ: ±2 dB @ 3 kHz and above
our products by incorporating new and improved materials,
[MR524 / 624 / 824]
components and manufacturing methods. Therefore, we
reserve the right to change these specifications at any
time without notice.

12 MR524 • MR624 • MR824 Powered Studio Monitors

MR524 Dimensions

Owner’s Manual
7.1" / 180 mm 8.7" / 221 mm

WEIGHT
10.2 lb /
4.6 kg

11.1" /
281 mm

MR624 Dimensions
8.3" / 210 mm 11.2" / 284 mm

WEIGHT
16.5 lb /
7.5 kg

12.9" /
328 mm

MR824 Dimensions
10.1" / 256 mm 12.6" / 320 mm

WEIGHT
23.0 lb /
10.4 kg

15.7" /
400 mm

Owner’s Manual 13
 MR524 • MR624 • MR824 Powered Studio Monitors

14
RCA +HI VDC
UNBALANCED HI-FREQUENCY HI-FREQUENCY
LINE INPUT HIGH FREQ POWER AMPLIFIER DRIVER
CROSSOVER +2 dB
XLR HI-FREQ 0
2
MR Block Diagram

BALANCED 1 TWEETER
LO-FREQ –2 dB
LINE INPUT 3
INPUT LEVEL

and are hereby acknowledged.

1/4" ANGLED PARKING ONLY
BALANCED / –HI VDC
UNBALANCED
LINE INPUT

+HI VDC
LO-FREQUENCY LO-FREQUENCY
ACOUSTIC OVEREXCURSION

©2017 LOUD Technologies Inc. All Rights Reserved.

POWER AMPLIFIER DRIVER
SPACE PROTECT
A
B
C WOOFER

60 Hz [MR524]
50 Hz [MR624]

MR524 • MR624 • MR824 Powered Studio Monitors

40 Hz [MR824] –HI VDC

FUSE POWER

FRONT PANEL LED

+
HI VDC
–

EI POWER +
LO VDC
TRANSFORMER –

This manual also contains names and marks of other companies which belong to those respective companies,
The following are trademarks or registered trademarks of LOUD Technologies Inc.: MR Series and the Running Man.
Limited Warranty

Owner’s Manual
Please keep your sales receipt in a safe place.
This Limited Product Warranty (“Product Warranty”) is provided by LOUD Technologies Inc. (“LOUD”)
and is applicable to products purchased in the United States or Canada through a LOUD-authorized
reseller or dealer. The Product Warranty will not extend to anyone other than the original purchaser
of the product (hereinafter, “Customer,” “you” or “your”).
For products purchased outside the U.S. or Canada, please visit www.mackie.com to find contact
information for your local distributor, and information on any warranty coverage provided by the
distributor in your local market.
LOUD warrants to Customer that the product will be free from defects in materials and workmanship
under normal use during the Warranty Period. If the product fails to conform to the warranty then LOUD
or its authorized service representative will at its option, either repair or replace any such nonconforming
product, provided that Customer gives notice of the noncompliance within the Warranty Period to the
Company at: www.mackie.com or by calling LOUD technical support at 1.800.898.3211 (toll-free
in the U.S. and Canada) during normal business hours Pacific Time, excluding weekends or LOUD
holidays. Please retain the original dated sales receipt as evidence of the date of purchase. You will
need it to obtain any warranty service.
For full terms and conditions, as well as the specific duration of the Warranty for this product, please
visit www.mackie.com.
The Product Warranty, together with your invoice or receipt, and the terms and conditions located
at www.mackie.com constitutes the entire agreement, and supersedes any and all prior agreements
between LOUD and Customer related to the subject matter hereof. No amendment, modification
or waiver of any of the provisions of this Product Warranty will be valid unless set forth in a written
instrument signed by the party to be bound thereby.

Owner’s Manual 15
16220 Wood-Red Road NE
Woodinville, WA 98072 • USA
Phone: 425.487.4333
Toll-free: 800.898.3211
Fax: 425.487.4337
www.mackie.com