Monoprice 18802 User Manual

Commercial Audio 4x 120-watt 5-channel 4-zone 100/70V

Mixer/Matrix Amplifier with Digital Media Player

P/N 18802

User's Manual

CONTENTS

SAFETY WARNINGS AND GUIDELINES .............................................................................................................................. 4

INTRODUCTION ....................................................................................................................................................................................... 6

FEATURES ..................................................................................................................................................................................................... 6

CUSTOMER SERVICE ............................................................................................................................................................................ 7

PACKAGE CONTENTS ......................................................................................................................................................................... 7

PRODUCT OVERVIEW ........................................................................................................................................................................ 8

Front Panel ............................................................................................................................................................................................ 8

Rear Panel ...............................................................................................................................................................................................9

Remote Control ................................................................................................................................................................................ 11

CONSTANT VOLTAGE VS LOW IMPEDANCE SPEAKER SYSTEMS ............................................................. 11

INSTALLATION ........................................................................................................................................................................................ 13

Speaker Connections ................................................................................................................................................................. 13

Line Out Connections ............................................................................................................................................................... 14

Connecting a Telephone Paging System ................................................................................................................. 15

FM Antenna Connection ......................................................................................................................................................... 15

Monitor Connection ................................................................................................................................................................... 16

Setting Priority ................................................................................................................................................................................ 16

Microphone and Line Connections ............................................................................................................................... 17

RS-232 Connection ....................................................................................................................................................................... 17

Power Connection ........................................................................................................................................................................ 17

Sample Connection Diagram ............................................................................................................................................. 18

Block Diagram ................................................................................................................................................................................... 19

INITIAL SETUP ........................................................................................................................................................................................ 20

OPERATION ............................................................................................................................................................................................... 22

Channel and Zone Controls ................................................................................................................................................. 22

Media Player Controls .............................................................................................................................................................. 23

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Bluetooth® Connection .......................................................................................................................................................... 24

FM Playback ...................................................................................................................................................................................... 24

MP3 Recording ............................................................................................................................................................................... 24

RS-232 Control ................................................................................................................................................................................ 25

SPECIFICATIONS ...................................................................................................................................................................................29

TECHNICAL SUPPORT ..................................................................................................................................................................... 30

REGULATORY COMPLIANCE .................................................................................................................................................... 30

Notice for FCC ................................................................................................................................................................................ 30

Notice for Industry Canada ................................................................................................................................................... 31

3

SAFETY WARNINGS AND GUIDELINES

Please read this entire manual before using this device, paying extra attention to these

safety warnings and guidelines. Please keep this manual in a safe place for future

reference.

 Do not install this device on an unstable surface where it could fall and cause

either personal injury or damage to the device and/or other equipment.

 This device is intended for indoor use only.
 Do not expose this device to water or moisture of any kind. Do not place drinks

or other containers with moisture on or near the device. If moisture does get in

or on the device, immediately unplug it from the power outlet and allow it to

fully dry before reapplying power.

 Do not touch the device, the power cord, or any other connected cables with

wet hands.

 Do not expose this device to excessively high temperatures. Do not place it in,

on, or near heat sources, such as a fireplace, stove, radiator, etc. Do not leave it

in direct sunlight.

 This device ventilates excessive heat through the slots and openings in the case.

Do not block or cover these openings. Ensure that the device is in an open area

where it can get sufficient airflow to keep from overheating.

 Do not place or install this device in an area where it can be exposed to

excessive amounts of dust, humidity, oil, smoke, or combustible vapors.

 Use only in a well-ventilated area. Do not use in close, confined spaces.
 Prior to operation, check the unit and power cord for physical damage. Do not

use if physical damage has occurred.

 Before plugging the unit into a power outlet, ensure that the outlet provides the

same type and level of power required by the device.

 This device uses a grounded power cord and requires a ground connection for

safe operation. Ensure that the power source has a proper ground connection.

Do not modify the plug or use a "cheater" plug to bypass the ground connection.

 Disconnect the unit from the power source when replacing the fuse. Replace the

fuse only with the same type.

4

 Unplug this device from the power source when not in use.
 Take care to prevent damage to the power cord. Do not allow it to become

crimped, pinched, walked on, or become tangled with other cords. Ensure that

the power cord does not present a tripping hazard.

 Never unplug the unit by pulling on the power cord. Always grasp the connector

head or adapter body.

 Ensure that power is turned off and disconnected before making any electrical

connections.

 Remove the batteries from the controller if it will go unused for a lengthy period

of time.

 Clean using a soft, dry cloth only. Do not use chemical cleaners, solvents, or

detergents. For stubborn deposits, moisten the cloth with warm water.

 This device has no user serviceable parts. Do not attempt to open, service, or

modify this device.

 If using this amplifier to drive a 70V or 100V speaker array, ensure that the total

wattage rating of the speaker array does not exceed 80% of the amplifier's rated

RMS power level, i.e., 96 watts.

 Because high voltage is present on the 70V and 100V speaker output terminals,

always use the terminal covers to prevent electric shock from accidental contact.

 Do not attempt to connect more than one speaker type to each Zone. You can

have a 4Ω load on one Zone and a 70V or 100V constant voltage speaker array

on another Zone, but cannot mix any of the different types of speaker arrays on

a single Zone.

5

INTRODUCTION

Thank you for purchasing this 5-channel 4-zone Mixer/Matrix Amplifier! This amp

features three combination XLR/TRS balanced/unbalanced inputs, which can be set to

accept a standard microphone input, a microphone input with +48V phantom power, or

a line level input. It also has two unbalanced stereo RCA line level inputs. It has four

independent 120 watt amplifiers, which can drive 4-ohm loads or a 70V or 100V

constant voltage speaker array. A media player is included, which features a built-in FM

tuner and an mp3 player, which can playback files from a drive connected to the USB

port or an SD™ card inserted in the SD/MEDIA slot. It includes thermal, short-circuit,

clipping, and overload protection circuits, as well as a ground lift switch. It can also

interface with external phone systems for telephone paging.

FEATURES

 Four independent 120-watt amplifiers capable of driving 4Ω loads, as well as 70V

or 100V constant voltage speaker arrays

 Three combination XLR/TRS balanced/unbalanced inputs capable of connecting

microphone level, microphone level with Phantom power, or line level sources

 Two unbalanced stereo RCA inputs
 Independent gain controls on all inputs
 Any input can be directed to any or all outputs
 Balanced line outputs for each zone
 Built-in media player with FM tuner and mp3 player for playback of files on a

connected USB drive or an SD™ card

 Can record the active audio sources and save as mp3 files on a connected USB

drive or SD card

 RS-232 serial control
 Can interface with external phone systems for telephone paging
 Thermal, short-circuit, clipping, and overload protection circuits
 1-watt, 8-ohm amplifier for driving a monitor speaker
 Ground lift option

6

CUSTOMER SERVICE

The Monoprice Customer Service department is dedicated to ensuring that your

ordering, purchasing, and delivery experience is second to none. If you have any

problem with your order, please give us an opportunity to make it right. You can

contact a Monoprice Customer Service representative through the Live Chat link on our

website www.monoprice.com or via email at [e-mail]. Check the

website for support times and links.

PACKAGE CONTENTS

Please take an inventory of the package contents to ensure you have all the items listed

below. If anything is missing or damaged, please contact Monoprice Customer Service

for a replacement.

1x 5-channel 4-zone mixer/matrix amplifier

1x AC power cord

1x User's manual

7

PRODUCT OVERVIEW

Front Panel

1. MUTE Button and LED Indicator: The LED illuminates when Mute has been

activated.

2. Z1-Z4 Buttons: Zone selector buttons for the built-in Media Player. The buttons

illuminate when selected.

3. Monitor Level Indicators: LED indicators show the overall output level for the

Monitor.

4. Monitor LEVEL Knob: Adjusts the overall volume level of the Monitor.

5. Zone 1-4 Level Indicators: LED indicators show the output level for each of the

four Zones.

6. Zone 1-4 Monitor Buttons: Buttons to enable or disable the Monitor for each of

the four Zones. The button will illuminate when selected.

7. Zone 1-4 LEVEL Knobs: Adjusts the individual volume level for each of the four

Zones.

8. Power Switch: Powers the amplifier on or off.

9. POWER/PROTection LED Indicator: The LED illuminates blue when the amplifier

is powered on and illuminates red when the amplifier is in protection mode.

10. Channels 1-5 TREBLE Controls: Cuts or boosts the high frequency output of each

individual Channel. The adjustment range is -10dB to +10dB.

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11. Channels 1-5 BASS Controls: Cuts or boosts the low frequency output of each

individual Channel. The adjustment range is -10dB to +10dB.

12. Channels 1-5 LEVEL Knobs: Adjusts the volume level for each individual Channel.

13. Media Player: The Media Player consists of a built-in FM tuner and an mp3 player

with an associated SD™ card slot USB port. See the

section for operating details.

Rear Panel

Media Player Controls

1. AC Input Connector and Fuse Holder: Plug the included AC power cord into the

panel connector. To change the fuse, use a small screwdriver to pry the fuse

holder open. A spare T12AL 250V fuse is included inside the fuse holder.

2. TELephone Zone Selector DIP Switch and VOLUME Control: Selects which Zones

that the Telephone input will broadcast and adjusts to the Telephone input

volume level.

3. Channel 5 Line Input and GAIN Control: Stereo RCA connectors for the Channel 5

Line input and control for adjusting the amount of gain to apply to the input.

4. Channel 4 Line Input and GAIN Control: Stereo RCA connectors for the Channel 4

Line input and control for adjusting the amount of gain to apply to the input.

5. Channel 3 Input and GAIN Control: Combination XLR/TRS connector for the

Channel 3 input and control for adjusting the amount of gain to apply to the

input.

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6. Channel 2 Input and GAIN Control: Combination XLR/TRS connector for the

Channel 2 input and control for adjusting the amount of gain to apply to the

input.

7. Channel 1 Input and GAIN Control: Combination XLR/TRS connector for the

Channel 1 input and control for adjusting the amount of gain to apply to the

input.

8. REMOTE MICrophone Input: Not used.

9. RS232 Port: DE-9 (aka DB-9) male connector to connect a computer for

automated control. See the RS-232 Control section for details.

10. Channels 1-3 Input Type Switches: Slide switches to select the type of input

signal for Channels 1-3. Set the switch to the LINE position for line level input, the

MIC position for input from a dynamic microphone, or the PHANTOM position

for input from a condenser microphone that needs +48V phantom power.

11. Cooling Fan: Cooling fan and ventilations holes. Do not cover the ventilation

holes.

12. Zones 1-4 OUTPUT Connectors: Speaker connectors for the output of each

individual Zone.

13. Zones 1-4 LINE OUTputs: Balanced and unbalanced line output connectors for

each individual Zone. Whatever is being output to the speakers will be output as

a line level signal for each individual Zone.

14. Antenna Input: Input connector for connecting a 300-ohm FM antenna.

15. TELephone PAGING Input: Balanced input connectors for connecting an external

telephone paging system.

16. PRIORITY Terminals: The normal priority order of the inputs is:

Channel 1, Telephone, Channel 2, Channel 3, Channel 4, Channel 5, Media

Player

When the priority input contacts are closed/shorted, the priority order is:

Telephone, Channel 1, Channel 2, Channel 3, Channel 4, Channel 5, Media

Player

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17. MONITOR Output: Speaker connectors for connecting a Monitor speaker. The

output is 1 watt at 8 ohms.

18. Ground Switch: Allows you to choose normal grounding or ground lift.

Remote Control

1. Power Button

2. Mode Button

3. Previous and Next Buttons

4. Volume Increase and Decrease

Buttons

5. Number Buttons

6. Play/Pause Button

7. EQ Button

8. Mute Button

9. Cycle Play Button

10. Stop Button

Note: The remote control can be function at
distances up to 26 feet (8 meters) and at
angles up to ±35 degrees horizontally and ±15 degrees vertically.

CONSTANT VOLTAGE VS LOW IMPEDANCE SPEAKER

SYSTEMS

A constant voltage speaker system differs from a traditional low impedance (e.g., 8-

ohm) speaker system in that it uses a step-up transformer at the audio source to raise

the voltage and lower the current on the transmission line. At the speaker end, a step-

down transformer converts the signal back to a normal speaker level voltage. This

reduces power loss during transmission, which allows for the use of longer speaker wire

runs using smaller gauge wire.

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Additionally, a constant voltage speaker system allows for the use of multiple speakers

on each channel, without the need for complicated impedance calculations and

configurations. In a constant voltage system, all speakers on a given channel are

connected in parallel and the complicated impedance calculations are replaced by a

simple wattage calculation.

For example, if you want to connect two speakers per channel in a traditional 8-ohm

speaker system, you must either connect them in series, which results in an overall 16-

ohm impedance, or in parallel, which results in an overall 4-ohm impedance. In the first

case, the 16-ohms impedance effectively halves the output power of your amplifier,

resulting in lower overall volume levels. In the latter case, the 4-ohms impedance means

that your amplifier will have to work harder and must be rated as stable at 4 ohms.

Adding a third speaker to the mix would complicate it further, producing either a 24-

ohm or 2.67-ohm overall impedance. Note that very few amplifiers are stable under 2-

ohm loads, so that is usually not an option.

On the other hand, with a constant voltage system, you consider first the RMS output

wattage of the amplifier. This should be reduced by 20% to compensate for insertion

loss. Each individual speaker on a given channel is set to a value such that the total does

not exceed the rated power, less 20%. You do not need to worry about making the

total as close as possible to the limit; just ensure that the total does not exceed the

limit. For example, with this 120-watt amplifier, the total load from the speakers should

not exceed 96 watts.

If all speakers are set to the same wattage value, they will all have the same volume

level. If one speaker is set to a higher wattage value, it will be louder than the others,

while a speaker set to a smaller value will be quieter than the others. This allows you to

compensate for the environment in which the speaker is placed. For example, a speaker

placed outside would need to be louder than a speaker placed in a small room.

12

INSTALLATION

Speaker Connections

This amplifier supports four separate output zones, each driven by a dedicated 120-watt

amplifier. You can connect speaker arrays with an overall 4-ohm impedance or constant

voltage speaker arrays at 70 or 100 volts.

1. Create up to four individual speaker arrays. If using low-impedance speakers,

ensure that the overall impedance of the array is 4 ohms. If using 70 or 100 volt

speakers, set the wattage value on each speaker to something that produces a

total load of 96 watts or less.

2. Lift the bottom of the terminal cover over the Zone 1 OUTPUT connectors. Using

a flat head or Phillips screwdriver, loosen the COM screw, then loosen the 4Ω,

70V, or 100V screw, depending on the type of speaker array being connected.

Note that only one type of connection can be used for each zone.

3. Insert the stripped end of the negative speaker wire lead for the first speaker

array under the COM screw plate, then tighten the screw.

4. Insert the stripped end of the positive speaker wire lead for the first speaker

array under the 4Ω, 70V, or 100V screw plate, then tighten the screw.

5. Flip the terminal cover back for the OUTPUT terminals and press on the bottom

to click it into place.

6. Repeat steps 2-5 for each other Zone.

13

Line Out Connections

Each zone features a balanced/unbalanced line output that will mirror the speaker

output. You can then connect this output to the input of another amplifier for more

speakers in larger spaces, a subwoofer for better low-end response, mixer, an audio

recorder, or other device with line level inputs. This example will use Zone 1, but applies

to other Zones.

1. Prepare your balanced or unbalanced connecting cable. If connecting to a TRS or

XLR input, you should make a balanced connection. If connecting to an RCA or

TS input, you must make an unbalanced connection.

2. Lift the bottom of the terminal cover over the Zone 1 LINE OUT connectors.

3. If making an unbalanced connection, use a flat head or Phillips screwdriver to

loosen the G and + screws. If making a balanced connection, loosen the - screw,

as well.

4. Insert the positive lead under the + screw plate, then tighten the screw.

5. If making an unbalanced connection, insert the negative lead under the G screw

plate, then tighten the screw. If making a balanced connection, insert the

negative lead under the - screw plate instead, then tighten the screw.

6. If making a balanced connection, insert the ground lead under the G screw plate,

then tighten the screw.

7. Plug the other end of the Line Out cable into the line input on your other device.

8. Flip the terminal cover for the LINE OUT connectors down and press the bottom

to click it into place.

9. Repeat for the other Zones, as desired.

14

Connecting a Telephone Paging System

This amplifier provides a 600-ohm balanced input for integrating an external telephone

paging system. Perform the following steps to connect your telephone system.

1. Lift the bottom of the terminal cover over the TEL PAGING connectors.

2. Using a flat head or Phillips screwdriver, loosen the T, R, and G screws.

3. Insert the ground lead from the telephone system under the G screw plate, then

tighten the screw.

4. Insert the ring lead from the telephone system under the R screw plate, then

tighten the screw.

5. Insert the tip lead from the telephone system under the T screw plate, then

tighten the screw.

6. Flip the terminal cover for the TEL PAGING connectors down, then press on the

bottom to click it into place.

7. For those Zones you want to receive telephone paging broadcasts, slide the

corresponding numbered DIP switch up to the ON position. Slide the other DIP

switches down toward the numbers.

FM Antenna Connection

Perform the following steps to connect a 300-ohm FM antenna.

1. Lift the bottom of the terminal cover over the TEL PAGING connectors.

2. Using a flat head or Phillips screwdriver, loosen the FM screw.

3. Insert the antenna lead under the FM screw plate, then tighten the screw.

4. Flip the terminal cover for the TEL PAGING connectors down, then press on the

bottom to click it into place.

15

Monitor Connection

The amplifier provides a single-channel speaker output for connecting an 8-ohm

monitor speaker. Perform the following steps to connect a monitor speaker.

1. Lift the bottom of the terminal cover over the MONITOR connectors.

2. Using flat head or Phillips screwdriver, loosen the 1W + and 8Ω - screws.

3. Insert the negative speaker wire lead under the 8Ω - screw plate, then tighten

the screw.

4. Insert the positive speaker wire lead under the 1W + screw plate, then tighten

the screw.

5. Flip the terminal cover for the MONITOR connectors down, then press on the

bottom to click it into place.

Setting Priority

By default, the priority order of inputs is as follows:

Channel 1, Telephone, Channel 2, Channel 3, Channel 4, Channel 5, Media Player

When the priority input contacts are closed/shorted, the priority order is:

Telephone, Channel 1, Channel 2, Channel 3, Channel 4, Channel 5, Media Player

Perform the following steps if you wish to have the Telephone input take priority over

Channel 1.

1. Lift the bottom of the terminal cover over the PRIORITY connectors.

2. Using a flat head or Phillips screwdriver, loosen the two PRIORITY screws.

3. Insert one end of a shorting wire under one of the screw plates, then tighten the

screw.

4. Insert the other end of the shorting wire under the other screw plate, then

tighten the screw.

5. Flip the terminal cover for the PRIORITY connectors down, then press on the

bottom to click it into place.

16

Microphone and Line Connections

The amplifier features three combination XLR/TRS connectors for connecting

microphones or line level inputs, plus two pairs of stereo RCA connectors for line level

inputs. Perform the following steps to make microphone and line connections.

1. Insert the XLR or TRS/TS connector from a microphone or line

level source into the CH 1 input.

2. If the connected device is a dynamic microphone, slide the CH 1

Input Type Switch to the MIC position. If the connected device is

a condenser microphone, which requires +48V phantom power,

slide the switch to the PHANTOM position. If the connected

device is a line level source, slide the switch to the LINE position.

3. Repeat steps 1 and 2 for the CH 2 and CH 3 inputs, as desired.

4. Plug the left RCA output of your line level source into the CH 4 L RCA jack, then

plug the right RCA output into the CH 4 R RCA jack.

5. Repeat step 4 for the CH 5 input, as desired.

RS-232 Connection

A 9-pin DE-9 (aka DB-9) serial connector is provided, which you can connect to a

computer for automated control. Perform the following steps to connect a computer to

the amplifier.

1. Plug one end of a 9-pin serial cable into the RS232 jack on the amplifier, then

tighten the screws to secure it in place.

2. Plug the other end of the serial cable into the serial connector on your computer.

Power Connection

1. Ensure that the Power Switch on the front panel is in the OFF position.

2. Plug the included AC power cord into the AC Input Connector and Fuse Holder,

then plug the other end into a nearby AC power outlet.

17

Sample Connection Diagram

18

Block Diagram

19

INITIAL SETUP

Perform the following steps for the initial power on and setup.

1. Ensure that the Power Switch is in the OFF position.

2. Using a small flat head screwdriver, turn all six GAIN controls on the rear panel

fully counterclockwise to the minimum position.

3. Using a small flat head screwdriver, set all five BASS and all five TREBLE tone

controls on the front panel to the midpoint 0 position.

4. Turn all ten LEVEL controls on the front panel fully counterclockwise to the 0

position.

5. Flip the Power Switch to the ON position. After a few seconds, the POWER/PROT

LED should glow blue, indicating that the amplifier is operating properly. If it

glows red instead, turn the amp off and check all connections.

6. The LCD Display on the media player should show the time. If not, press the

MODE button repeatedly until the time is displayed.

7. Press and hold the MODE button until the display starts blinking the year.

8. Using the button to increase the displayed value or the button to

decrease the displayed value, set the displayed year to the current year.

9. Press the MODE button and the display will change to show the month and

date, with the month flashing. Use the and buttons to set the displayed

month to the current month.

10. Press the MODE button and the date will start to flash. Use the and

buttons to set the displayed date to the current date.

11. Press the MODE button to display the time, with the hour value blinking. Use the

and buttons to set the displayed hour to the current hour. Note that it

uses a 24 hour clock.

12. Press the MODE button and the minute value will start blinking. Use the and

buttons to set the displayed minute to the current minute.

13. Press the MODE button to save the newly set date and time values.

14. Press the MODE button until an FM frequency number is displayed.

15. Use the and buttons to tune to a local FM station.

20

16. Press and hold the button to decrease the volume level of the media player

until the display shows 0.

17. Press the Z1 button underneath the media player to set the Media Player output

to Zone 1.

18. Press and hold the to increase the output volume level of the media player

step-by-step while slowly increasing the ZONE 1 LEVEL control until the FM

station is playing at a comfortable listening level. This is the base line volume to

which we will match the outputs and volume levels of the other inputs.

19. Start playback of audio on the CH 1 audio source.

20. Press the Z1 button in the CH 1 section to enable output of CH 1 audio to Zone 1.

21. Using a small flat head screwdriver slowly adjust the CH 1 GAIN control on the

rear panel alternately with the CH 1 LEVEL control on the front panel until the

volume level matches that of the FM tuner (both audio sources should be

simultaneously audible on the Zone 1 speakers).

22. Press the CH 1 Z1 button to turn off CH 1 audio from the Zone 1 speakers.

23. Repeat steps 19-22 for the CH 2-5.

24. Follow the instructions for your phone system to broadcast a page.

25. Using a small flat head screwdriver, slowly adjust the TEL VOLUME until the page

volume is at the desired level.

Congratulations, you have successfully installed and setup your amplifier!

21

OPERATION

Channel and Zone Controls

This section details the Channel and Zone controls using CH 2 and ZONE 1 as an

example. Other Channels and Zones are controlled the same way.

1. BASS Control: Adjusts the amount of bass in the

CH 2 source in a range from -10dB to +10dB. Use a

small flat head screwdriver to make any necessary

adjustments.

2. TREBLE Control: Adjusts the amount of treble in

the CH 2 source in a range from -10dB to +10dB.

Use a small flat head screwdriver to make any

necessary adjustments.

3. CH 2 LEVEL Knob: Adjusts the output of the CH 2

source. The CH 1-5 LEVEL controls effectively mix

and balance the five inputs.

4. MUTE Button: Press the MUTE button to mute the

CH 2 audio source. The LED above the button will

glow when MUTE is enabled.

5. ZONE Buttons: Directs the output of CH 2 audio to

any or all of the four Zones. When a Zone is

enabled, the button will glow blue.

6. ZONE 1 LEVEL Knob: Adjusts the overall output

volume level for Zone 1.

7. MON Button: Press the MON button to direct the output of Zone 1 to the

Monitor. The button will glow blue when Zone 1 is being monitored.

8. LED Indicators: The -15, -10, -5, and 0dB LEDs indicate the output level of Zone 1.

When the CLP LED illuminates, the input source signal is too strong and should

be reduced until the LED no longer illuminates. When the PROT LED is

illuminated, the amplifier is in protection status.

22

Media Player Controls

1. USB Port: Plug a USB device with mp3 tracks into the USB Port to play the audio

tracks. The USB Port has the highest priority and the media player will

automatically switch to the USB Port whenever a USB drive is connected. The

LCD Display will show USB in the upper left corner.

2. SD™ Card Slot: Insert an SD™ card with mp3 tracks into the SD Card Slot to play

the audio tracks. The SD Card Slot has the second highest priority and the media

player will automatically switch to the SD Card Slot whenever an SD card is

inserted. The LCD Display will show SD in the lower left corner, unless a USB

drive is connected.

3. LCD Display: The LCD Display shows the track number and play time. When the

media player is not being used, the LCD Display will show the current time.

4. Previous Track Button: Momentarily press the button to skip back to the

previous track. Press and hold the button to decrease the volume level of

the media player.

5. Play/Pause Button: With an audio track playing, momentarily press the

button to pause playback. With playback paused, momentarily press the

button to resume playback.

6. Next Track Button: Momentarily press the button to skip ahead to the next

track. Press and hold the button to increase the volume level of the media

player.

7. MODE Button: Momentarily press the MODE button to cycle through the FM

Radio, Bluetooth®, and audio playback modes. Press and hold the MODE button

to set the time and date.

23

Bluetooth® Connection

Perform the following steps to establish a Bluetooth® connection between the media

player and your mobile device.

1. Momentarily press the MODE button until the LCD Display shows bt. The media

player is now ready to pair with your mobile device.

2. Open the Bluetooth settings on your mobile device and scan for nearby devices.

Locate and select the A 18802 entry.

3. Once the connection is established, you can use the controls on the media

player or on your mobile device to control audio playback.

FM Playback

Perform the following steps to use the media player's built-in FM tuner.

1. Ensure that you have an FM antenna connected to the unit and that it is close to

a nearby window for improved reception.

2. Momentarily press the MODE button until an FM frequency is shown on the LCD

Display.

3. Perform one of the following methods for tuning an FM station.
 Momentarily press the button to automatically scan for an FM station.

The scan will stop on the first station with a sufficiently strong signal.

Momentarily press the button again to continue the scan until you find a

station you want to listen to.

 Use the and to manually tune to a specific FM frequency. Each press

of the button decreases the displayed frequency by 1 MHz, while each

press of the button increases the displayed frequency by 1 MHz.

MP3 Recording

1. Insert an SD™ card into the SD Card Slot or plug a USB drive into the USB Port.

2. Press and hold the button for 3 seconds. The LCD Display will show REC and

the media player will begin recording an mp3 file mixed from all connected

audio sources (Mic 1-4 and Aux 1-2).

24

3. Once the recording is finished, momentarily press the MODE button to end

recording and save the file. The recorded file will begin playback automatically.

RS-232 Control

This amplifier can be controlled remotely by a computer via the RS232 port on the rear

panel. After physically connecting to a computer, use a third party serial debugging

assistant software to connect to the amplifier using the following settings:

9600 baud rate

No parity

8 data bits

1 stop bit

The amplifier responds to the following commands:

1. PC serial port issued instructions to get button data

Instructions: FF 05 00 05

2. PC serial port issued instructions for the LED indicator

Instructions: FF 05 01 06

3. PC serial port instructions for setting the priority level

Instructions: FF 05 02 07

4. PC serial port issue instructions of get telephone, the remote switch

Instructions: FF 05 04 09

5. PC serial port issue instructions of control MP3 connection ZONE1

OPEN: FF 06 81 87

CLOSE: FF 06 01 07

6. PC serial port issue instructions of control MP3 connection ZONE2

OPEN: FF 06 82 88

CLOSE: FF 06 02 08

7. PC serial port issue instructions of control MP3 connection ZONE3

OPEN: FF 06 83 89

CLOSE: FF 06 03 09

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8. PC serial port issue instructions of control MP3 connection ZONE4

OPEN: FF 06 84 8A

CLOSE: FF 06 04 0A

9. PC serial port issue instructions of control CH1 connection ZONE1

OPEN: FF 06 85 8B

CLOSE: FF 06 05 0B

10. PC serial port issue instructions of control CH1 connection ZONE2

OPEN: FF 06 86 8C

CLOSE: FF 06 06 0C

11. PC serial port issue instructions of control CH1 connection ZONE3

OPEN: FF 06 87 8D

CLOSE: FF 06 07 0D

12. PC serial port issue instructions of control CH1 connection ZONE4

OPEN: FF 06 88 8E

CLOSE: FF 06 08 0E

13. PC serial port issue instructions of control CH3 connection ZONE1

OPEN: FF 06 89 8F

CLOSE: FF 06 09 0F

14. PC serial port issue instructions of control CH3 connection ZONE2

OPEN: FF 06 8A 90

CLOSE: FF 06 0A 10

15. PC serial port issue instructions of control CH3 connection ZONE3

OPEN: FF 06 8B 91

CLOSE: FF 06 0B 11

16. PC serial port issue instructions of control CH3 connection ZONE4

OPEN: FF 06 8C 92

CLOSE: FF 06 0C 12

17. PC serial port issue instructions of control MON connection ZONE1

OPEN: FF 06 8D 93

CLOSE: FF 06 0D 13

26

18. PC serial port issue instructions of control MON connection ZONE2

OPEN: FF 06 8E 94

CLOSE: FF 06 0E 14

19. PC serial port issue instructions of control MON connection ZONE3

OPEN: FF 06 8F 95

CLOSE: FF 06 0F 15

20. PC serial port issue instructions of control MON connection ZONE4

OPEN: FF 06 90 96

CLOSE: FF 06 10 16

21. PC serial port issue instructions of control CH2 connection ZONE1

OPEN: FF 06 91 97

CLOSE: FF 06 11 17

22. PC serial port issue instructions of control CH2 connection ZONE2

OPEN: FF 06 92 98

CLOSE: FF 06 12 18

23. PC serial port issue instructions of control CH2 connection ZONE3

OPEN: FF 06 93 99

CLOSE: FF 06 13 19

24. PC serial port issue instructions of control CH2 connection ZONE4

OPEN: FF 06 94 9A

CLOSE: FF 06 14 1A

25. PC serial port issue instructions of control CH4 connection ZONE1

OPEN: FF 06 95 9B

CLOSE: FF 06 15 1B

26. PC serial port issue instructions of control CH4 connection ZONE2

OPEN: FF 06 96 9C

CLOSE: FF 06 16 1C

27. PC serial port issue instructions of control CH4 connection ZONE3

OPEN: FF 06 97 9D

CLOSE: FF 06 17 1D

27

28. PC serial port issue instructions of control CH4 connection ZONE4

OPEN: FF 06 98 9E

CLOSE: FF 06 18 1E

29. PC serial port issue instructions of control CH5 connection ZONE1

OPEN: FF 06 99 9F

CLOSE: FF 06 19 1F

30. PC serial port issue instructions of control CH5 connection ZONE2

OPEN: FF 06 9A A0

CLOSE: FF 06 1A 20

31. PC serial port issue instructions of control CH5 connection ZONE3

OPEN: FF 06 9B A1

CLOSE: FF 06 1B 21

32. PC serial port issue instructions of control CH5 connection ZONE4

OPEN: FF 06 9C A2

CLOSE: FF 06 1C 22

33. MP3 Mute

OPEN: FF 06 9D A3

CLOSE: FF 06 1D 23

34. CH1 Mute

OPEN: FF 06 A2 A8

CLOSE: FF 06 22 28

35. CH2 Mute

OPEN: FF 06 9E A4

CLOSE: FF 06 1E 24

36. CH3 Mute

OPEN: FF 06 9F A5

CLOSE: FF 06 1F 25

37. CH4 Mute

OPEN: FF 06 A0 A6

CLOSE: FF 06 20 26

28

38. CH5 Mute

Model

18802

Frequency Response

80Hz~16KHz

Total Harmonic Distortion

≤1%

Signal-to-Noise Ratio

≥65dB

Tone Controls

Bass: ±10dB

Treble: ±10dB

Output Power

4x 120 watts

Output Interface

4Ω, 70V, 100V

Input Sensitivity and Impedance

CH1, CH2, CH3 MIC: ±2.5mV/600Ω

CH1, CH2, CH3 PHANTOM: ±2.5mV

CH1, CH2, CH3 LINE: ~175mV/10kΩ

CH4, CH5 LINE: 350mV/10kΩ

TEL: 350mV/10kΩ

Line 1-4 Output Level

1V/600Ω

SD™ Card Support

SD card up to 32GB capacity formatted for FAT16 or

FAT32 with all mp3s in root directory. Does not support

file folders.

Input Power

120 VAC, 50/60 Hz

Maximum Power Consumption

750 watts

Dimensions

19.1" x 17.3" x 5.2" (484 x 440 x 132 mm)

Weight

25.8 lbs. (11.7 kg)

OPEN: FF 06 A1 A7

CLOSE: FF 06 21 27

SPECIFICATIONS

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TECHNICAL SUPPORT

Monoprice is pleased to provide free, live, online technical support to assist you with

any questions you may have about installation, setup, troubleshooting, or product

recommendations. If you ever need assistance with your new product, please come

online to talk to one of our friendly and knowledgeable Tech Support Associates.

Technical support is available through the online chat button on our website

www.monoprice.com or through email by sending a message to [e-mail].

Check the website for support times and links.

REGULATORY COMPLIANCE

Notice for FCC

This device complies with Part 15 of the FCC rules. Operation is subject to the following

two conditions: (1) this device may not cause harmful interference, and (2) this device

must accept any interference received, including interference that may cause undesired

operation.

Modifying the equipment without Monoprice's authorization may result in the

equipment no longer complying with FCC requirements for Class B digital devices. In

that event, your right to use the equipment may be limited by FCC regulations, and you

may be required to correct any interference to radio or television communications at

your own expense.

This equipment has been tested and found to comply with the limits 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 in a residential installation. This

equipment generates, uses and can radiate radio frequency energy and, if not installed

and used in accordance with the instructions, may cause harmful interference to radio

communications. However, there is no guarantee that interference will not occur in a

particular installation. If this equipment does cause harmful interference to radio or

television reception, which can be determined by turning the equipment off and on,

the user is encouraged to try to correct the interference by one or more of the

following measures:

30

 Reorient or relocate the receiving antenna.
 Increase the separation between the equipment and receiver.
 Connect the equipment into an outlet on a circuit different from that to which

the receiver is connected.

 Consult the dealer or an experienced radio/TV technician for help.

Notice for Industry Canada

This Class B digital apparatus complies with Canadian ICES-003.

Cet appareil numérique de la classe B est conforme à la norme NMB-003 du Canada.

SD™ is a trademark or registered trademarks of SD-3C, LLC in the United States, other
countries, or both.

31