Pure Resonance Audio RMA240BT User manual

INSTALLATION AND OPERATION MANUAL
Caution: Please read this manual carefully before operating.
Damage caused by misuse is not covered by the warranty.
RMA240BT MIXER AMPLIFIER

SAFETY PRECAUTIONS
�Be sure to read the instructions in this section carefully before use.
�Make sure to observe the instructions in this manual as the conventions of safety symbols and messages
regarded as very important precautions are included.
�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.
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 that which is specified
may result in fire or electric shock.
�Do not cut, kink, otherwise damage nor modify the power supply cord. In addition, avoid using the power
cord in close proximity to heaters, and never place heavy objects -- including the unit itself -- on the power
cord, as doing so may result in fire or electric shock.
�Be sure to replace the unit's terminal cover after connection completion. Because high voltage is applied
to the speaker terminals, never touch these terminals to avoid electric shock.
�Be sure to ground to the safety ground (earth) terminal to avoid electric shock. Never ground to a gas pipe
as a catastrophic disaster may result.
�Avoid installing or mounting the unit in unstable locations, such as on a rickety table or a slanted surface.
Doing so may result in the unit falling down, causing personal injury and/or property damage.
WHEN THE UNIT IS IN USE
�Should the following irregularity be found during use, immediately switch off the power, disconnect the
power supply plug from the AC outlet and contact your nearest dealer. Make no further attempt to operate
the unit in this condition as this may cause 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 case breaks
• If the power supply cord is damaged (exposure of the core, disconnection, etc.)
• If it is malfunctioning (no tone sounds)
�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!
CAUTION!
WARNING!

�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.
�Do not insert nor drop metallic objects or flammable materials in the ventilation slots of the unit's cover, as
this may result in 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.
�Make sure that the volume control is set to minimum position before power is switched on. Loud noise
produced at high volume when power is switched on can impair 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.
�Contact your dealer as to the cleaning. If dust is allowed to accumulate in the unit over a long period of
time, a fire or damage to the unit may result.
�If dust accumulates on the power supply plug or in the wall AC outlet, a fire may result. Clean it
periodically. In addition, insert the plug in the wall outlet securely.
�Switch off the power, and unplug the power supply plug from the AC outlet for safety purposes when
cleaning or leaving the unit unused for 10 days or more. Doing otherwise may cause 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 RMA240BT mixer amplifier with MP3, tuner, and Bluetooth adopts a
high-performance switching power supply and class H power amplifier chip combination; 1U chassis design,
high efficiency, lightweight, and a beautiful slim design.
FEATURES
1. MP3 decoding module supports USB / SD / Bluetooth / FM playback automatic switch. Configure MP3
remote control; support power-off memory and MIC recording function.
2. Support 1 channel EMC input, 2 AUX input, 4 MIC input.
3. Each channel has volume control function, master volume controls and bass/treble tone control.
4. Level indicator, overload, and protection indicator; a good short circuit, overload, overheating protection.
5. Mute, MIC input, MIC prior to line input; mute and MIC1 prior to other audio input, EMC prior to all audio
input.
6. Channel priority: EMC> MIC1> MIC2 / MIC3 / MIC4 / AUX1 / AUX2 / MP3.
7. The use of advanced and high performance power amplifier circuit, speaker output is 70V or 4 ohms;
rated output power is 240W.
8. AC power, power supply power 300W.
9. Forced air-cooling fan from front to back, starting up in uniform speed rotation, and then speeds up when
with the temperature is increasing; to meet the long working hours.
10. 24V DC power interface for DC 24V backup or optional.
11. 1U chassis design, high efficiency, lightweight, beautiful appearance.
FRONT PANEL
1. SD / MMC card slot
2. PREV / volume reduce
3. Playback / Pause
4. Next / volume plus
5. MP3 mode selection
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/OL/CLIP/SIG status
indicators
16. The power switch
17. The power indicator
18. LED display
19. USB interface
7

OUTPUT
4-16Ω70V
MUTE
AUDIO AUX2 AUX1
OUTPUT INPUT
MIC LINE PHANTOM
MIC LINE PHANTOM
MIC LINE PHANTOM
MIC LINE PHANTOM
MIC 4 MIC 3 MIC 2
EMC IN MUTE
G G G
G
+
MIC 1
FM ANT
G
70V/4-16 Ω
NC NC
123 5 7
415
68 9 1011 1213 14 16
17
18
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
MO D E E Q
S T O P
1
2
3
4
5
6
7
8
910
REMOTE CONTROL
1. Power switch
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
Normal remote control distance: 25 feet
Remote control usage attention:
1. When installing the battery, please mind electrode.
2. Aim remote control at the mixer amplifier.
3. When remote distance gets short and insensitive, please change the battery.
4. Please take out the battery when not in use it for a long period of time.
5. Avoid dropping remote.
REAR PANEL
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

4-16Ω70V
4-16Ω70V
OUTPUT
70V/4-16 Ω
NC NC
SPK- SPK+
OUTPUT
70V/4-16 Ω
NC NC
SPK- SPK+
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 make sure that the power switch of 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.
OPERATION ILLUSTRATION
CONNECT THE SPEAKERS:
With the 70V and 4-16Ω selector switch
to 70V position, as shown below:
With the 70V and 4-16Ω selector switch
to 4-16Ω position, as shown below:
PLEASE NOTE:
1. Before connecting the speakers, please make sure that the equipment is powered off. In the
case of the power being 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 make sure that the sum of the rated input power
of the speakers to be connected is less than the rated power of equipment.
PLEASE NOTE:
1. Before powering on, please check and make sure there are no problems with the cable and
connection.
2. When you turn off the system, turn off the equipment, and then turn off the connected
equipment.
70 Volt speaker: According to the rated
power of the power amplifier, adjust 70V
transformer tap accordingly.
Fixed resistance speaker: 4-16Ω

1. USB and SD card interface with functions of priority to automatically play audio.
2.MODE button: press MODE to choose radio, Bluetooth or audio playback.
3." " button: If pressed quickly, it will play the last song; if pressed for longer it will decrease the volume.
4." " button: When playing music, press it one time quickly to pause, press it again to play.
5." " button: If pressed quickly, it will play the next song; if pressed for longer it will increase the volume.
USB
SD
S D /M E D I A
MODE
USING A MICROPHONE:
1. Turn the volume knob to the left and connect the microphone and microphone input interface.
2. Turn the volume knob in the right position.
3. Face the microphone and speak loudly. Turn the volume knob to the right, until the output signal is no
longer distorted. If the input is high but the voice output is low then increase the volume by using the volume
knob. If the speaker volume is very high, then reduce the volume by using the volume knob.
SHUTDOWN THE SYSTEM:
1. Turn the volume knob to the left until the minimum position.
2. Turn off the panel power switch of the professional power amplifier, at 0ff. Then shut off the processor
equipment and 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 of the power switch will lead to equipment failure.
2. Even when the switch is in the off status, there will be a little current in the equipment. If you
won’t be using the equipment for a long period of time, please unplug the power cord from the
wall AC socket.
BUILT-IN MP3 PLAYER OPERATION METHOD:
PLEASE NOTE:
1. When using the built-in MP3 player buttons, please pay attention to the strength used,
avoid excessive force causing damage to the MP3 player button.
2. When an SD card or USB interface is inserted, please insert in the correct way, avoid the
wrong way or forcing it too hard causing damage to the SD card or USB interface.

BLUETOOTH OPERATION:
1.Press the Mode button on the remote to ensure media player is in Bluetooth mode, indicated by letters
“BT.”
2. Go to your device’s settings and find then select device “PA-02086B”. No password should be required.
3. Device should pair within a minute or so.
4. If pairing is unsuccessful, power down your amplifier, close the settings app on your device.
5. Power up amplifier & reopen settings. Repeat first steps to attempt to pair again. If you still have an issue
pairing, please reboot personal device & cycle amplifier power.
6. Once pairing is successful, open music app. Ensure device volume is turned up to at least 75% capacity
on device.
7. Adjust volume of audio player with volume buttons on infrared remote (OK to set at max volume - 32)
8. Adjust master volume to desired level, ensuring amplifier does not show clip or show any red lights.
OPERATION INSTRUCTION FOR MIC/ MIC2/ MIC3/ MIC4 INPUT SWITCH:
As shown in the right picture, the input switch includes: line input, Mic input, and Phantom power supply.
1.When switching to Line input, you can input the source, such as CD, VCD, DVD and some other external
audio equipment.
2.When switching to the MIC input, you can use the dynamic microphone.
3.When switching to PHANTOM, the input interface with 48V phantom power supply, you can use the
condenser microphone.
TROUBLESHOOTING
SYMPTOM PROBLEM
1. Power switch is not opened
2. All lines are connected, but there is
no sound.
3. The sound suddenly disappears in
normal status.
4. Low sound
5. Sound is distorted
1. Power line is cut off
2. The protection function of the equipment is
not activated
1. The power switch is not opened or the power
plug has a bad connection
2. The fuse is burnt
3. The volume knob is not opened or turned down
to an extra low level
4. There is no audio signal input
5. There is a short-circuit in the speaker line
1. The equipment is at a very high temperature
and has gone into protection status
2. The connection wire has a bad connection
The equipment is set to be a low impedance
connection, but the speakers are connected
with high impedance
The input level of Mic or external equipment
is too high

REAR PANEL CONNECTIONS
70V
70V

BLOCK DIAGRAM
70V

4-16Ω/70V
Rated Power
Output Level
Input Sensitivity
MIC: 5mV
LINE: 350mV±20mV
AUX: 350mV ±20mV
EMC: 775mV ±40mV
±1mV
Pre-output AUDIO OUT: 1V±50mV/100Ω
SNR
THD
Indicator
Frequency Response
Operation Temperature
Storage Temperature
+5℃+40℃~
- 20℃+70℃~
Relative Humidity <95% ( No condensation)
Power Consumption
Weight
Tones Low frequency
High frequency
:± 10dB at 100Hz；
:± 10dB at 10KHz
Power indicator
Voltage
240W
110-120V 60HZ
200W
11.50 lbs (5.22 kg)
Shipping Weight 13 lbs (5.9 kg)
1.73” (44 mm) x 19.05” (484 mm) x 11.61” (295 mm)
Dimensions (H x W x D)
SPECIFICATIONS
80Hz~16KHz +/- 3db
MIC1、2、3: 66dB；AUX1、2: 85dB
≤0.05%(at 1KHz，1/3 rated power)
Cooling Mode Forced fan with variable speed cooling with side entry airow
Protection Modes Overheat, overcurrent, and short current protection

Over 100 Over 100
Over 100
ON
OFF
POWER
MIC1 INPUT
PROT
MIC /4 AUX 1 AUX 2MIC 3
MIC 1 MIC 2 MASTER
70V
SIG
CLIP
USB
SD
S D /M E DI A
MODE
TREBLEBASS
100 100 100 100 100 100 4-16 Ω
ON
OFF
POWER
MIC1 INPUT
PROT
MIC /4 AUX 1 AUX 2MIC 3
MIC 1 MIC 2 MASTER
70V
SIG
CLIP
USB
SD
S D /M E D I A
MODE
TREBLEBASS
100 100 100 100 100 100 4-16 Ω
44
48
484
44
295
6
44
436
OUTPUT
4-16Ω70V
MUTE
AUDIO AUX2 AUX1
OUTPUT INPUT
MIC LINE PHANTOM MIC LINE PHANTOM MIC LINE PHANTOM
MIC LINE PHANTOM
MIC 4 MIC 3 MIC 2
EMC IN MUTE
G G G
G
+
MIC 1
FM ANT
G
70V/4-16 Ω
NC NC
REAR PANEL CONNECTIONS
Keep all sides of the unit over 10 cm away from objects that may obstruct air flow to prevent
the unit’s internal temperature rise.

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.