Pure Resonance Audio MA120BT User manual

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

SAFETY WARNINGS
1. Read and keep these instructions.
2. Heed all warnings and follow all instructions.
3. Do not use this device near water.
4. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
5. Do not install near any heat sources such as radiators, heat registers, stoves, or other equipment that
produces heat.
6. Do not defeat the safety purpose of the polarized or grounding type plug. A polarized plug has two blades
with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide
blade or the third prong is provided for your safety. If the provided plug does not fit into your outlet, consult
an electrician for replacement of the obsolete outlet.
7. Protect the power cord from being walked on or pinched, particularly near the plugs, convenience
receptacles, and the point where the cord exits from the device.
8. Only use attachments/accessories that are specified by the manufacturer.
9. Only use with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the
device. When a cart is used, use caution when moving the cart-device combination to avoid injury from
tip-over.
10. Unplug this device during lightning storms or when unused for long periods of time.
11. Refer all servicing to qualified service personnel. Servicing is required when the device has been
damaged in any way, such as the power-supply cord or plug is damaged, liquid has been spilled or objects
have fallen into the device, the device has been exposed to rain or moisture, does not operate normally, or
has been dropped.
12. This device should not be exposed to dripping or splashing water, and no object filled with liquid, such
as a vase, should be placed on, or near the device.
14. In order to disconnect the device from the AC power, the power cord should be completely removed
from the outlet.
15. WARNING: To reduce the risk of fire or electric shock, do not expose this device to rain or moisture.
16. A device with a protective ground terminal should be connected to an electrical outlet with a protective
grounding connection.
WARNING!
TO PREVENT FIRE OR SHOCK HAZARD, DO NOT USE THE PLUG WITH
AN EXTENSION CORD, RECEPTACLE OR OTHER OUTLET UNLESS THE BLADES CAN BE FULLY
INSERTED. TO PREVENT BLADE EXPOSURE AND REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS DEVICE TO RAIN OR MOISTURE, MATCH WIDE BLADE PLUG TO WIDE SLOT,
AND FULLY INSERT.

INTRODUCTION
DESCRIPTION
This 7-channel mixer-amplifier from Pure Resonance Audio with built-in 70V/100V transformer technology
provides a simple to operate and reliable 6-input solution with a built in Bluetooth media player for
installation in commercial applications. Balanced and unbalanced inputs 70 Volt, 100 Volt, 8 ohm or 4 ohm
outputs, and a compact size and interface are all combined to make this mixer-amp an easy choice for any
application in need of background music and general announcements. It is perfect for use in restaurants,
retail stores, offices, schools, hospitality, etc. and is equipped with paging and MOH (Music On Hold).
The on-board plug-in play MP3 player accepts SD cards and USB thumb drives that can be plugged in on
the front panel. The unit includes RCA inputs and RCA line level outputs, a telephone input with VOX priority
and a MOH (Music on Hold) output, as well as an XLR input with phantom power. The IR remote for MP3, FM
Radio and Bluetooth provides freedom and flexibility allowing full control, even from across the room.
This compact public address amplifier also supports playback from Bluetooth-enabled devices such as PCs,
iPads, tablets or mobile phones, enabling anyone to walk-in and link up with their Bluetooth Wireless
Connection to instantly play music or any sound source file.
FEATURES
• 7-channel powered mixer amplifier (6 inputs + Bluetooth Media Player)
• Volume Controls for Mic 1-3, Line 1-2, MP3/FM Radio, Bass, Treble and Master
• MP3 Player, FM Radio & Bluetooth (with IR remote control)
• USB and SD inputs on front panel
• Power output rating 120 Watts
• Built-in 70V/100V transformer
• Speaker outputs: 70V, 100V, 4, 8 and 16 Ohms
• Mic 1 of balanced XLR input (with phantom power)
• Mic 2-3 microphone or line switchable
• Line 1-2 input of RCA inputs
• DIP switches for Mic/Line, phantom power and microphone priority
• Unbalanced 6.3 mm phone jack input
• One RCA line output (0.775 line level 0 dBV)
• Telephone input (600 Ohm/100mV) with VOX priority and MOH (Music on Hold) (600 Ohm 1 Volt)
• LED indicators for power clip, protect signal, Mic 1-3, Line 1-2 and telephone inputs
• Short-circuit, clip, overload and high temp protection
• 24 VDC Emergency backup supply
• 115V 60 Hz & 24V DC both operation system

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5
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13 16 17 18 20
14 19 21
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78910 11
12 3 4 6
12 13 14 15
FRONT PANEL
1. Mp3/FM/Bluetooth Media Player
Module
2. Clip Indicator
3. Protection Indicator
4. Power Indicator
5. Output Level Meters
6. AC Power Switch
7. Mic1 Attenuator
8. Mic/Line Input 2 Attenuator
9. Mic/Line Input 3 Attenuator
10. Line Input 1 Attenuator
11. Line Input 2 Attenuator
12. Tel Input Attenuator
13. Bass
14. Treble
15. Master Volume Control
REAR PANEL
1. AC Power
2. AC Fuse
3. FM Antenna
4. 24V DC Battery Input
5. Speaker Output COM
6. Speaker Output 4 Ohms (+)
7. Speaker Output 8 Ohms (+)
8. Speaker Output 16 Ohms (+)
9. Speaker Output 70V (+)
10. Speaker Output 100V (+)
11. Tel Input COM (-)
12. Tel Input HOT (+), 600 Ohms, 1 Volt
13. MOH Output COM (-)
14. MOH Output HOT (+)
15. Input 2 Mic/Line Selector
16. Input 3 Mic/Line Selector
17. Dipswitch for MIC/LINE Selector, Phantom
Power and Microphone Priority
18. Microphone 1 Input
19. Line 3 Input
20. Line 4 Input
21. Line Output

AMPLIFIER OPERATION GUIDE
70V LINE SYSTEM
For 70V systems, connect the amplifier to the first speaker in the system using speaker wire which has
adequate current rating to handle the total wattage output of the amplifier.
Connect the speaker wire to the “70V” output terminal on the amplifier. Then, connect the positive (+)
connection to the positive connection on the speaker and “COM” connection to the negative (-) connection
on the speaker. Connect the subsequent speakers in parallel to the first speaker - positive to positive and
negative to negative - as shown below.
SPEAKER TERMINALS
The MA120BT offers 3 low impedance outputs: 4Ω, 8Ω, 16Ω. 70V/100V, commercial outputs are also
available.
PLEASE NOTE: ONLY ONE WIRE SHOULD BE CONNECTED TO THE “COM” SCREW TERMINAL AND ONE
WIRE TO THE SELECTED IMPEDANCE OR VOLTAGE SCREW TERMINAL. MULTIPLE COMBINATIONS
CANNOT BE DONE AT THE SAME TIME.
The low impedance section, 4Ω, 8Ω, and 16Ω, is designed for use with low impedance speakers. The
70V/100V section is designed for multiple speaker distribution. When using the 70V/100V output, the
speakers have to be equipped with a 70V/100V transformer. The maximum amount of speakers to be placed
on your distribution line is in relation to the power allocated to each speaker. The total wattage (number of
speakers x transformer wattage tap) must not exceed the maximum RMS output power of 120W. Failure to
do so may cause permanent damage to the amplifier.

OPERATION STEPS
STARTUP GUIDE
• When all connections to the amplifier have been made, turn all volume knobs down. Then, turn the power
switch to the on position and the power “ON” LED will illuminate. Turn the “BASS” and “TREBLE” controls to
the 12 o’clock position (pointing straight up) and turn the “MASTER” volume knob up slowly.
• Make sure a signal is being sent to channels 1, 2, 3, 4 or 5 and gradually increase the volume control for
that channel until the output is heard through the speakers. Turn up the “MASTER” to the maximum required
volume level and reduce the channel volume control if necessary.
• If a microphone is connected to “MIC1” input, make sure it is switched on and, if it requires phantom
power, make sure this feature is enabled. Gradually increase its volume control while speaking into the
microphone until the required volume level is reached.
• If the “Microphone Priority” feature is enabled, audio playback volume through channels 2-5 will be auto-
matically reduced when speaking into the microphone.
• In addition to the channel and the “MASTER” volume controls, there are “BASS” and “TREBLE” EQ
controls to adjust the tone of the overall output. At the 12 o’clock position, these controls are applying no
effect to the signal (no boost or cut). Moving the BASS control clockwise boosts low frequencies, moving it
counter clockwise will cut low frequencies. Likewise, moving the TREBLE control clockwise boosts the high
frequencies, moving it counter clockwise will cut high frequencies.
BLUETOOTH
• Press the Mode button on the infrared remote to ensure media player is in Blueooth mode, indicated by the
letters “BT”.
• Go to your device’s settings and find then select device “UP-321B”. No password should be required.
• Device should pair within a matter of minutes.
• If pairing is unsuccessful, power down your amplifier and close the settings app on your device.
• Power up amplifier & reopen settings. Repeat steps 1-3 and attempt to pair again. If you still have issues
pairing, please reboot personal device & cycle amplifier power.
• Once pairing is successful, open music app. Ensure device volume is turned up to at least 75% capacity on
device.
• Adjust volume of audio player with volume buttons on infrared remote (OK to set at max volume - 32).
• Adjust master volume to desired level, ensuring amplifier does not show clip or show any red lights.
USB/SD PLAYBACK
• Push a USB thumb drive into the USB port and/or an SD card into the SD card input.
• Press the “CD/USB/SD” button to ensure that the player is set to play from the required memory device.
• Press the “PLAY/PAUSE” button to play the current track and press again to pause as needed.
• Searching and playback of tracks is the same as described above for the CD player.

OPERATION STEPS (CONTINUED)
FM TUNER
Press the FM select button to switch to the FM tuner function. Use the PREVIOUS or NEXT buttons to select
a stored channel.
Tuning and Storing Stations
• Use the “FORWARD/REVERSE” seek buttons to manually select the station.
• Alternatively, press and hold the “FORWARD/REVERSE” seek buttons to auto search for available stations.
• Upon finding a station, the auto search will stop, giving the option to store this station.
• At this point, pressing the “PLAY/PAUSE” button will flash a “00” channel number in the display.
• Use the “PREVIOUS/NEXT” buttons to select an appropriate channel memory.
• Press “PLAY/PAUSE” again to confirm and store the station into the selected channel memory.
• Auto search can be stopped at any time by pressing the “FORWARD/REVERSE” seek buttons.
MUTE ON/OFF
• Pressing the “MUTE ON/OFF” button will mute the output of the audio player.
• Pressing and holding the “MUTE ON/OFF” button will put the audio player in standby mode.
• Press this button again to restore functions from standby mode.
MUSIC ON HOLD
The “MOH OUTPUT” will feed music on your telephone system or PABX. A dedicated input should be
available on your telephone system. Please refer to a qualified technician if you cannot identify this input.
Outgoing signal should be connected to “COM” and “HOT”.
TELEPHONE PAGING INPUT
This special “TEL INPUT” will allow you to page into the audio system using a telephone or PABX system. At
the end of the announcement, the system will return to its normal operation. The telephone paging input has
priority over all other inputs, except for the EMC (fire alarm) input.
Final volume adjustment will be made with the “TEL” volume control located on the front panel of the
amplifier.

Rated Power Output
Speaker Outputs
120W
70V, 100V and 4 Ohms, 8 Ohms, or 16 Ohms
Connectors
Mic 1 input by balanced XLR with phantom power
Input 2-3 Mic/Line switchable unbalanced 6.3 mm phone jack
Line 1-2 inputs by RCA; Line output by RCA
Attenuation
Input
Frequency Response
S/N Ratio
THD
Protection
Dimensions (H x W x D)
Weight
Microphone 1-3, line 1-2 and MP3/FM Radio, bass/treble and master
MIC 1-3: 5-8mV, 600Ω; Line, 150-470mV, 10KΩ, unbalanced RCA
60Hz - 15kHz (+/-3dB)
Line ≥85dB, Mic ≥ 72dB
Less than 0.5%
Short-circuit, clip, overload, and high temp protection
3.5” (88 mm) x 11.8” (300 mm) x 10.8” (275 mm)
6.6 lbs (3 kg)
Line Out 0.775 (0dBV)
Power Consumption 60W
Power Supply 115V 60Hz & 24V
SPECIFICATIONS
PURE RESONANCE AUDIO®
[phone]
[e-mail]
www.PureResonanceAudio.com
Specifications may change without notice.

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.