Pure Resonance Audio RMA120BT User manual

Caution: Please read this manual carefully before operating.
Damage caused by misuse is not covered by the warranty.

WHEN INSTALLING THE UNIT
•Do not expose the unit to rain or an environment where it may be splashed by water or other liquids, as
doing so may result in fire or electric shock.
•Use the unit only with the voltage specified on the unit. Using a voltage higher than what is specified
may result in fire or electric shock.
•Do not cut, bend, damage or modify the power cord. Also avoid using the power cord near heating
appliances and never place heavy objects (including the unit itself) on the power cord as this could result
in fire or electric shock.
•Be sure to replace the unit's terminal cover after connection is complete. Because high voltage is
applied to the speaker terminals, never touch these terminals to avoid electric shock.
•Make sure the equipment is grounded to the safety ground (earth) terminal to avoid electric shock. Never
ground to a gas line as this could lead to a catastrophic disaster.
•Do not install or place the unit in an unstable place such as a wobbly table or sloped surface. Otherwise,
the device may fall and cause personal injury and/or property damage.
WHEN THE UNIT IS IN USE
•Should any of the following irregularities be found during use, immediately switch off the power, discon-
nect the power supply from the outlet and contact your nearest dealer. Do not attempt to use the unit in
this condition as it may result in fire or electric shock.
•If you detect smoke or a strange smell coming from the unit
•If water or any metallic object gets into the unit
•If the unit falls, or the unit casing breaks
•If the power supply cord is damaged (exposure of the wires, heat damage, missing prongs, etc.)
•If the unit malfunctions, such as not producing any tone or sound
•To prevent a fire or electric shock, never open or remove the unit case as there are high voltage compo-
nents inside the unit. Refer all servicing to your nearest dealer.
WARNING!
SAFETY PRECAUTIONS
•Be sure to read the instructions in this section carefully before use.
•Please carefully follow the safety symbols and messages in this manual, as they include important
precautions to ensure your safety.
•We also recommend you keep this instruction manual handy for future reference.
SAFETY SYMBOL AND MESSAGE CONVENTIONS
Safety symbols and messages described below are used in this manual to prevent bodily injury and property
damage which could result from mishandling. Before operating your product, read this manual first and
understand the safety symbols and messages so you are thoroughly aware of the potential safety risks.
Indicates a potentially hazardous situation which, if mishandled, could result in
death or serious personal injury.
Indicates a potentially hazardous situation which, if mishandled, could result in
moderate or minor personal injury, and/or property damage.
WARNING!
CAUTION!

•Do not place cups, bowls, or other containers of liquid or metallic objects on top of the unit. If they
accidentally spill into the unit, this may cause a fire or electric shock.
•Avoid inserting or dropping any metallic objects or flammable materials into the fan opening on the back
of the unit to prevent the risk of fire or electric shock.
WHEN INSTALLING THE UNIT
•Never plug in or remove the power supply plug with wet hands, as doing so may cause electric shock.
•When unplugging the power supply cord, be sure to grasp the power supply plug; never pull on the cord
itself. Operating the unit with a damaged power supply cord may cause a fire or electric shock.
•When moving the unit, be sure to remove its power supply cord from the wall outlet. Moving the unit with
the power cord connected to the outlet may cause damage to the power cord, resulting in fire or electric
shock. When removing the power cord, be sure to hold its plug to pull.
•Do not block the ventilation slots in the unit's cover. Doing so may cause heat to build up inside the unit
and result in fire.
•Avoid installing the unit in humid or dusty locations, in locations exposed to the direct sunlight, near the
heaters, or in locations generating sooty smoke or steam as doing otherwise may result in fire or electric
shock.
WHEN THE UNIT IS IN USE
•Do not place heavy objects on the unit as this may cause it to fall or break which may result in personal
injury and/or property damage. In addition, the object itself may fall off and cause injury and/or damage.
•Before switching on the power, ensure that the volume control is set to the minimum position. Loud
noise produced at a high volume when power is switched on can damage hearing.
•Do not operate the unit for an extended period of time with the sound distorting. This is an indication of
a malfunction, which in turn can cause heat to generate and result in a fire.
•To prevent a fire or damage to the unit, regularly clean it and ensure that dust does not accumulate over
a long period of time. Consult your dealer regarding cleaning.
•To prevent a fire, periodically clean the power supply plug and the wall AC outlet. Ensure that the plug is
inserted securely into the wall outlet.
•For safety purposes, switch off the power and unplug the unit from the AC outlet when cleaning or leav-
ing it unused for 10 days or more. Failure to do so may result in a fire or electric shock.
An all-pole mains switch with a contact separation of at least 3 mm in each pole shall be incorporated in the
electrical installation of the building.
CAUTION!
PLEASE NOTE:
Due to product upgrades, some of the features and specification in this user manual may or
may not match the actual functions of the unit.

GENERAL DESCRIPTION
The Pure Resonance Audio RMA120BT 5-channel commercial rack mount mixer amplifier provides quick and
easy Bluetooth connection and 120 watts of high-performance Class D power encased in a slim, lightweight,
space-saving design. The multimedia player is equipped with inputs for TF cards and USB thumb drives and
features a built-in FM tuner. With a forced air-cooling fan and emergency priority capabilities, this compact
and affordable mixer amplifier perfectly accommodates the long hours of commercial businesses and
reliability needed for public address. The RMA120BT is ideal for offices, schools, restaurants, retail stores, or
any background music, paging, or announcement sound system.
FEATURES
•Advanced high-performance amplifier circuit
•1U chassis, high efficiency, and lightweight design
•120 Watts of rated power with 4 - 16 Ohm/70V speaker output
•Master volume control, bass and treble tone controls, and individual channel volume controls
•The MP3 media player supports Bluetooth, USB, TF, and FM tuner
•Supports 1 emergency channel input, 2 AUX inputs, and 4 MIC inputs with 1 MIC priority input
•Forced air-cooling fan speeds up as the temperature increases to meet long working hours
•Level, overheating, overload, and short-circuit protection with indicators
•IR Remote control included for the MP3 player with replaceable CR2025 3V lithium battery

SPECIFICATIONS
4 - 16Ω/70V
Rated Power Output
Speaker Outputs
Input Sensitivity
Pre-Output AUDIO OUT: 1V±50mV/ 100Ω
S/N Ratio
THD
Indicator
Frequency Response
Operation Temperature
Storage Temperature
Relative Humidity <95% (No condensation)
Power Consumption
Tones
Power, clipping, protection, and signal
Voltage
120W
110 - 120V 60Hz
180W
80 Hz - 16 kHz +/- 3 dB
MIC1, 2, 3, 4: 66dB; AUX1, 2: 85dB
≤0.05%
Cooling Mode Variable speed fan for forced air cooling
Protection Modes Over-heat, overload, short circuit
Weight 8.82 lbs (4 kg)
1.73” (44 mm) x 19.05” (484 mm) x 12.4” (315 mm)Dimensions (H x W x D)
11 lbs (4.99 kg)Shipping Weight
+5°C - +40°C
-20°C - 70°C
MIC: 5mV±1mV
LINE: 350mV±20mV
AUX: 350mV±20mV
EMC: 775mV±40mV
Low frequency: ± 10 dB at 100 Hz
High frequency: ± 10 dB at 10 kHz
Remote Control IR remote control with CR2025 3V lithium battery

REAR PANEL
7
FRONT PANEL
1. Recording function button
2. MP3 loop playback function button
3. Play/Pause
4. Next song/Volume reduce
5. USB interface
6. MIC1 unbalanced input jack
7. MIC1 volume control knob
8. MIC2 volume control knob
9. MIC3 volume control knob
10. MIC4 / AUX1 volume control knob
11. AUX2 volume control knob
12. BASS adjustment potentiometer
13. TREBLE adjustment potentiometer
14. Master volume control
15. PROT/70V/4-16Ω/CLIP/SIG status
indicators
16. Power switch
17. Power indicator
18. TF card slot
19. Previous song/Volume up
20. LCD display
21. Mode function button
1. AC power input socket
2. 70V/4-16Ω output interface
3. 70V/4-16Ω speaker output switch
4. Cooling fan
5. Line output interface, used to con-
nect the line input interface
6. 2-Channel AUX input interface, used
to connect AUX output interface
7. Line input/Mic input/Phantom power
switch for MIC4
8. MIC4/AUX1 Balance input
9. Line input/Mic input/Phantom power
switch for MIC3
10. MIC3 Balance input
11. Line input/Mic input/Phantom power
switch for MIC2
12. MIC2 Balance input
13. MUTE control switch
14. Line input/Mic input/Phantom power
switch for MIC1
15. EMC input interface
16. MUTE signal input port
17. FM radio antenna interface
18. MIC1 Balance input

OPERATION
CONNECT THE SPEAKERS
4-16Ω70V
OUTPUT
70V/4-16 Ω
NC NC
SPK- SPK+
With the 70V and 4-16Ω selector switch
to 70V position, as shown below:
4-16Ω70V
OUTPUT
70V/4-16 Ω
NC NC
SPK- SPK+
With the 70V and 4-16Ω selector switch
to 4-16Ω position, as shown below:
Fixed resistance speaker: 4-16Ω
REMOTE CONTROL
Normal remote control distance: 25 feet
Remote control usage attention:
1. When installing the battery, be mindful of the battery contacts.
2. Point the remote control towards the unit to ensure proper signal reception.
3. Replace the battery if the remote becomes unresponsive or has reduced range.
4. Remove the battery from the remote when not in use for an extended period.
5. Handle the remote with care and avoid dropping it to prevent damage.
M O D E E Q
S T O P
1. Power Button
2. Mode
3. Previous/Next
4. Volume Increase/Decrease
5. 0-9 Number Buttons
6. Play/Pause
7. Sound Effect Control
8. Mute
9. Cycle Play Button
10. Pause
70 Volt speaker: According to the rated
power of the power amplifier, adjust the
70V transformer tap accordingly.

CONNECT EXTERNAL DEVICES
1. Please ensure that the equipment and all other equipment to be connected are powered off.
2. Use the corresponding cable to connect this equipment and other external equipment.
CONNECT THE POWER LINE AND TURN IT ON
1. Please ensure that the power switch of the equipment and its connected equipment are turned off (in the
OFF position).
2. Turn the volume knob to the left.
3. Connect the supplied power line to the AC IN interface.
4. Plug the power line into the applicable socket.
5. Turn on the connected equipment (CD player, etc.), and then turn on the equipment.
PLEASE NOTE:
1. Before connecting the speakers, please ensure the equipment is powered off. If the power
is on, you may run the risk of electric shock.
2. Please make sure that there is no applied load to the speaker cables.
3. During the installation of speakers, please ensure that the sum of the rated input power of
the speakers to be connected is less than the rated power of the equipment.
PLEASE NOTE:
1. Before powering on, check and ensure there are no problems with the cable connection.
2. When you turn off the system, turn off the equipment and then the connected equipment.
USING A MICROPHONE
1. Turn the volume all the way down (to the left) and connect the microphone and microphone input
interface.
2. Speak into the microphone and gradually turn up the volume (to the right) until the output signal is clear
and not distorted.
3. If the voice output is too low, increase the volume using the knob until the desired volume is reached.
4. If the speaker volume is too high, reduce the volume using the knob until the desired volume is reached.
SHUTTING DOWN THE SYSTEM
1. Turn the volume knob to the minimum position (fully to the left).
2. Turn the power switch on the front of the amplifier to the "OFF" position. If applicable, also turn off any
connected processor and/or audio source equipment.
PLEASE NOTE:
1. When turning off the power switch, please wait about 5 seconds before turning it on again.
Continuous rapid turning on and off the power switch will lead to equipment failure.
2. Even when the switch is turned off, a small amount of current may still flow through the
equipment. If you won't be using the equipment for an extended period of time, unplug the
AC power cord from the wall socket to prevent unnecessary power consumption.

BUILT-IN MP3 PLAYER OPERATION METHOD:
PLEASE NOTE:
1. Please use caution when pressing the built-in MP3 player buttons to avoid applying
excessive force that could damage the button.
2. To avoid damaging the TF card or USB interface, insert them correctly and avoid using
excessive force. Incorrect insertion can also cause damage.
MODE button: Press to choose FM radio, USB, Bluetooth, or audio playback
(press and hold to forcibly turn on/off the amplifier)
Previous song (press and hold to increase the volume)
MP3 loop playback button with Repeat One / Repeat ALL / Random / Repeat Folder modes
Play / Pause (press and hold in FM mode to receive the station)
Recording button (press in PLAYING mode to record)
(press and hold to switch between recording and USB playback)
Next song (long press to decrease volume)
USB OPERATION
Press the MODE button to select the USB mode, and copy the MP3 file in the U disk (below 32G). It supports
MP3 / WAV / WMA / AEC / FLAC format.
TF CARD OPERATION
Insert a TF card (below 32G) to copy the MP3 file. It supports MP3 / WAV / WMA / AEC / FLAC format.
FM (RADIO RECEPTION) FUNCTION
Press the MODE button to select the FM mode, and then press and hold the PLAY / PAUSE button to receive
the radio station automatically. The radio stations received (depending on the sound received) depends on
the venue.
Note: Due to the possibilities of FM radio interference and the variables involved, it's not recommended to
use FM radio as your primary input source.
MP3 SONG LOOP PLAYBACK
In USB or TF card mode, play a song at will, and press the mode button to switch between Repeat One /
Repeat ALL / Random / Repeat Folder.
FUNCTIONAL MEMORY OPERATION
Turn on the amplifier by the remote controller or press and hold the MODE button. After it is turned on, it can
remember the function mode selected before. If you unplug the power cable and turn it on again, the default
is Bluetooth mode.

TROUBLESHOOTING
SYMPTOM PROBLEM
1. Amplifier is not working
2. All lines are connected, but there
is no sound
3. Sound suddenly cuts out during
normal usage
4. Low sound levels
5. Sound is distorted
a. The amplifier is not plugged in
b. The power outlet is dead
c. The amplifier is in protection mode
a. The power switch is not on
b. The master volume is turned down
c. An individual channel volume is turned down
d. The media player volume is turned down
e. No audio signal is being played
f. The wiring is incorrect
a. The equipment overheated and went into
protection mode
b. The wiring has a bad connection
The impedance level of the amplifier and speakers
do not match
The input audio level is too high, causing interference
VOLUME +/- OPERATION
Long press the Previous Song button on the unit to increase the volume quickly, and long press the Next
Song button to decrease the volume quickly.
BLUETOOTH OPERATION
1. Press the Mode button on the remote to ensure the media player is in Bluetooth mode, indicated by
the letters "BT."
2. Find and select "PRA-BT" from your device's Bluetooth settings. No password should be required.
3. The device should pair within a minute or so.
4. If pairing is unsuccessful, power down your amplifier and close the settings app on your device.
5. Power up the amplifier and reopen the settings. Repeat the first steps to attempt to pair again. If you still
have an issue pairing, please reboot your personal device and cycle the amplifier's power.
6. Once pairing is successful, open the music app. Ensure device volume is turned up to at least 75%
capacity on the device.
7. Adjust the volume of the audio player with volume buttons on the infrared remote
(OK to set at max volume - 32).
8. Adjust the master volume to the desired level, ensuring the amplifier does not show clip or show any
red lights.
OPERATION INSTRUCTION FOR MIC1/ MIC2/ MIC3/ MIC4 INPUT SWITCH
The input switch includes: Line input, Mic input, and Phantom power supply
1. The input switch includes: Line input, Mic input, and Phantom power supply
2. When switching to Line input, you can input the source, such as CD, VCD, DVD, and other external
audio equipment.
3. When switching to the MIC input, you can use a dynamic microphone.
4. When switching to PHANTOM, the input interface with a 48V phantom power supply, you can use a
condenser microphone.

REAR PANEL CONNECTIONS
Audio source equipment like CD/MP3 player
Alarm signal generator
MIC
Speaker
AC power input

BLOCK DIAGRAM
Amplifier module
Switching power supply
DC 24V inverter power supply
MP3/BT Module
Amplifier output
AUDIO OUT
LCD display
Protection circuit
4-16Ω/ 70V switchover

DIMENSIONAL DIAGRAMS
Keep objects at least 4 inches away from the unit as not to obstruct airflow and cause the
internal temperature to rise.
Over 4” (100 mm) Over 4” (100 mm)
Over 4” (100 mm)
1.73” (44 mm)
17.17” (436 mm)
1.73” (44 mm)
12.4” (315 mm)
0.24” (6 mm)
1.73” (44 mm)
19.05” (484 mm)
1.89” (48 mm)

SERVICE
Ensure the problem is not related to operator error, or system devices that are external to this unit. Informa-
tion provided in the troubleshooting portion of this manual may help with this process. Once it is certain that
the problem is related to the product contact your warranty provider as described in the warranty section of
this manual.
LIMITED WARRANTY
PRO ACOUSTICS, LLC. ("PRO ACOUSTICS") warrants this product to the original purchaser to be free from
defects in materials and workmanship (subject to the terms set forth below), for the following periods from the
date of purchase.
THIS WARRANTY COVERS THE LISTED PRODUCTS AGAINST DEFECTS IN MATERIALS OR
WORKMANSHIP FOR THE FOLLOWING PERIOD
Warranty Terms
PRO ACOUSTICS will repair or replace (at PRO ACOUSTICS's option) this product or any defective parts
(excluding electronics and amplifiers) in this product.
Your authorized PRO ACOUSTICS dealer will inspect the product and, if your dealer is not equipped to
perform the repair of your PRO ACOUSTICS product, they will replace your product or return it to PRO
ACOUSTICS for repair, at their discretion. Proof of purchase in the form of a bill of sale or receipted invoice,
which is evidence that this product is within the warranty period, must be presented to obtain warranty
service.
This warranty is invalid if the factory applied serial number has been altered or removed from this product.
This warranty is invalid if this product was not purchased from a PRO ACOUSTICS authorized dealer. Cos-
metic damage or damage due to the accident, acts of God, misuse, abuse, negligence, commercial use, or
modification of, or to any part of, the product are not covered in this warranty. This warranty does not cover
damage due to improper operation, maintenance or installation, or attempted repair by anyone other than
PRO ACOUSTICS or a PRO ACOUSTICS dealer which is authorized to do PRO ACOUSTICS warranty work.
Any unauthorized repairs will void this warranty.
This warranty does not cover products sold as is.
REPAIRS OR REPLACEMENTS AS PROVIDED UNDER THIS WARRANTY ARE THE EXCLUSIVE REMEDY OF
THE CONSUMER/PURCHASER. PRO ACOUSTICS U.S.A. SHALL NOT BE LIABLE FOR ANY INCIDENTAL
OR CONSEQUENTIAL DAMAGES FOR BREACH OF ANY EXPRESS OR IMPLIED WARRANTY ON THIS
PRODUCT. EXCEPT TO THE EXTENT PROHIBITED BY LAW, THIS WARRANTY IS EXCLUSIVE AND IN LIEU
OF ALL OTHER EXPRESS AND IMPLIED WARRANTIES WHATSOEVER, INCLUDING BUT NOT LIMITED TO,
THE WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PRACTICAL PURPOSE.
This warranty gives you specific legal rights. You may have other rights which vary from state to state.
Speakers
Amplifiers & Electronics
Microphones
Accessories
2 Years
1 Year
1 Year
1 Year
PURE RESONANCE AUDIO®
[phone]
[e-mail]
www.PureResonanceAudio.com
Specifications may change without notice.