Monoprice 18803 Bedienungsanleitung

User’s Manual

PROT OUTPUT LEVELTEMP

4681 0 1 2 POWER

MIC 1

MIC 1 MIC 2 MIC 3 AUX 1 AUX 2 BASS TREBLE MASTER

4 6

-5

-4

-3

-2

-1 +1

-5

-4

-3

-2

-1 +1

4 6

OFF

P/N 18803 |60-Watt

P/N 14886 |120-Watt

P/N 18805 |240-Watt

Commercial Audio 5-Channel

70V/100VMixer Amplifier with Microphone Priority

CONTENTS

SAFETY WARNINGS AND GUIDELINES...............................................................................................................................3

INTRODUCTION........................................................................................................................................................................................4

FEATURES......................................................................................................................................................................................................5

PACKAGE CONTENTS.........................................................................................................................................................................5

PRODUCT OVERVIEW.........................................................................................................................................................................6

Front Panel.............................................................................................................................................................................................6

Rear Panel...............................................................................................................................................................................................7

CONSTANT VOLTAGE VS LOW IMPEDANCE SPEAKER SYSTEMS ..............................................................8

WIRE PREPARATION ............................................................................................................................................................................9

INSTALLATION AND SETUP.........................................................................................................................................................10

INSTALLATION NOTES.....................................................................................................................................................................13

FUNCTIONAL BLOCK DIAGRAM .............................................................................................................................................14

SPECIFICATIONS....................................................................................................................................................................................15

REGULATORY COMPLIANCE......................................................................................................................................................16

Notice for FCC ..................................................................................................................................................................................16

Notice for Industry Canada...................................................................................................................................................16

SAFETY WARNINGS AND GUIDELINES

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.

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.

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., 48 (18803), 96 (14886), or 192 (18805) watts, depending on

model

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

always use the included terminal cover to prevent electric shock from accidental

contact.

INTRODUCTION

Thank you for purchasing this 5-Channel 70V/100V Mixer Public Address Amplifier!

This amplifier features three microphone inputs and two auxiliary inputs, each of which

is active and mixed into the line and speaker level outputs. When an EMC input trigger

is detected, all outputs except MIC 1 are muted, allowing for the clear broadcast of

important messages. The amplifier can drive a speaker array consisting of one or more

speakers presenting a 4~16 ohm load or to one or more 70V or 100V speakers

connected in parallel as part of a large public address system.

FEATURES

5-channel (3 microphone and 2 line) mixer/amplifier

Amplifier rated for 60 (18803), 120 (14886), or 240 (18805) watts

70V, 100V, and low impedance 4~16 ohm speaker output options

Built-in rack mount ears and 2U height for mounting in a standard 19" equipment

rack

Unbalanced front panel input for MIC 1

Both balanced XLR and unbalanced TRS and RCA rear panel inputs for MIC 2 and

MIC 3

Phantom power option for MIC 2 and MIC 3

Two unbalanced RCA auxiliary/line inputs

One EMC priority input

Master volume, bass, and treble controls

Front panel level controls for all inputs

0-30dB variable muting for all channels except MIC 1 when MIC 1 is in use

Built-in short circuit, over-current, and high temperature protection circuits

Line level output of mixed signal for connection to other devices

PACKAGE CONTENTS

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

below.

1x 5-channel 70V/100V mixer public address amplifier

1x AC power cable (NEMA 5-15 to IEC 60320 C13)

1x User's manual

PRODUCT OVERVIEW

Front Panel

1. MIC 1 Input: Unbalanced stereo 1/4" (6.35mm) TRS microphone level input. This

input is never muted and always broadcasts, even when the EMC trigger is

detected.

2. MIC 1 / MIC 2 / MIC 3 Knobs: Mixing level controls for the three microphone

inputs.

3. AUX 1 / AUX 2 Knobs: Mixing level controls for the two auxiliary inputs.

4. BASS Knob: Master bass level control.

5. TREBLE Knob: Master treble level control.

6. MASTER Knob: Master volume level control.

7. ON / OFF Switch: Power switch.

8. POWER LED Indicator: Power LED indicator illuminates when power is applied.

9. OUTPUT LEVEL LED Indicators: Output level meter.

10. PROT LED Indicator: If a short circuit, overload condition, or excessive

temperature condition is detected, the output will be disconnected and the

PROT LED will illuminate, indicating that the protection circuit is active. To reset

the protection circuit turn the amplifier off, then back on.

11. TEMP LED Indicator: If excessive temperatures are detected, the TEMP LED will

illuminate.

Rear Panel

12. AC INPUT: Grounded AC power input and fuse holder.

13. OUTPUT: Speaker output terminals for 70V, 100V, and low impedance 4~16 ohm

speaker loads.

14. EMC INPUT: When a signal is detected on this input, all inputs except MIC 1 are

muted, allowing for clear broadcast of important messages.

15. MUTE: This knob controls the amount of automatic volume reduction that is

applied to all inputs except MIC 1 whenever a signal is detected on the MIC 1.

Unlike the total muting when an EMC trigger is detected, this only reduces the

volume of the other inputs, allowing you to talk over the other audio content.

The amount of signal reduction is from 0dB to 30dB.

16. MIC 2 / MIC 3: Unbalanced stereo 1/4" TRS microphone inputs.

17. MIC 2 / MIC 3 LINE INPUT: Unbalanced stereo RCA microphone/line level inputs.

18. AUX 1 INPUT / AUX 2 INPUT: Stereo line level RCA auxiliary inputs.

19. MIX OUT: Stereo line level RCA output of the final mix.

20. FAN: The cooling fan automatically turns on when the temperature reaches

+131°F (+55°C).

21. MIC 2 XLR GAIN / MIC 3 XLR GAIN: Use these knobs to control the amount of

gain applied to each of the two XLR microphone inputs.

22. MIC 2 +48V PHANTOM POWER / MIC 3 +48V PHANTOM POWER: Depress these

buttons to apply +48V phantom power to the respective XLR microphone input.

23. MIC 2 / MIC 3: Balanced mono XLR microphone inputs.

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.

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

simple wattage calculations.

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 the 120-watt model, the total load from 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.

WIRE PREPARATION

Regardless of which type of speaker array this amp will drive, you will need to use

speaker wire (not included) to connect the amp to the speaker array.

To prepare a length of speaker wire for connection, perform the following steps:

1. Use a wire stripper (not included) to remove about 3/8" (9.5mm) of insulation

from both conductors on one end of the wire.

2. Twist the exposed wire strands to ensure that the exposed section of wire

remains in a bundle.

3. Repeat steps 1-2 for the other end of the speaker wire.

INSTALLATION AND SETUP

Perform the following steps to install and setup this amplifier. The following instructions

will assume connection of a CD player, an FM tuner, and three microphones. Note that

each input connection, except MIC 1, is optional.

1. Power off and unplug all equipment that will be connected to this amplifier.

2. Using a stereo RCA cable (not included), plug one end into the AUX 1 input on

the amplifier, then plug the other end into the stereo output of your CD player.

3. Using a stereo RCA cable (not included), plug one end into the AUX 2 input on

the amplifier, then plug the other end into the stereo output of your FM tuner.

4. Plug a microphone (not included) into the MIC 1 input on the amplifier.

Note that this must be either a dynamic microphone or a condenser microphone

with its own power source. For best results, use a microphone with a power

switch.

5. Plug a microphone (not included) into one of the MIC 2 inputs on the amplifier.

6. Plug a microphone (not included) into one of the MIC 3 inputs on the amplifier.

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