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

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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

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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.

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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.

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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

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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 su[email protected]. 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

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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 Media Player Controls
section for operating details.
Rear Panel
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.

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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.

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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 Gand +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 Gscrew
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 Gscrew 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.

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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 Gscrews.
3. Insert the ground lead from the telephone system under the Gscrew plate, then
tighten the screw.
4. Insert the ring lead from the telephone system under the Rscrew plate, then
tighten the screw.
5. Insert the tip lead from the telephone system under the Tscrew 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.

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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.

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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.

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Sample Connection Diagram

19
Block Diagram

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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 0position.
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.