Monoprice 18800 Manuale utente

User’s Manual

P/N 18800

Commercial Audio 60-Watt 2-Channel

70V/100V Mixer Amplifier

CONTENTS

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

INTRODUCTION........................................................................................................................................................................................5

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

CUSTOMER SERVICE............................................................................................................................................................................5

PACKAGE CONTENTS.........................................................................................................................................................................6

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

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

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

CONSTANT VOLTAGE VS 8-OHM SPEAKER SYSTEMS..........................................................................................7

SAMPLE CONNECTION DIAGRAM ..........................................................................................................................................9

CONSTANT RESISTANCE INSTALLATION ..........................................................................................................................9

CONSTANT VOLTAGE INSTALLATION ................................................................................................................................11

BLOCK DIAGRAM.................................................................................................................................................................................13

SPECIFICATIONS....................................................................................................................................................................................14

TECHNICAL SUPPORT.......................................................................................................................................................................15

REGULATORY COMPLIANCE......................................................................................................................................................15

Notice for FCC ..................................................................................................................................................................................15

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

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.

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 expose this device to excessive vibration.

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.

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.

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.

Ensure that the terminal cover is installed over the speaker terminals before

applying power. These terminals carry high voltage and can cause severe electric

shock if touched during operation.

Always set the Master Volume knob to the minimum position before applying

power to the amplifier. Transient voltage spikes during power on can cause loud

popping in the speakers, which can damage the speakers.

Do not operate this amplifier for extended periods of time with audio distortion

present. Audio distortion can cause excessive heat and can damage the amplifier

and/or speakers.

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 watts.

INTRODUCTION

Thank you for purchasing this Commercial Audio 60-Watt 70V/100V Mixer Amplifier!

This amplifier is designed to drive a conventional 4-ohm or 8-ohm speaker system as

well as 70-volt and 100-volt constant voltage speaker systems. It features three

unbalanced 1/4" microphone inputs, two of which can be switched to unbalanced RCA

and 1/4" auxiliary jacks instead of microphone level inputs.

FEATURES

Three 1/4" microphone inputs

One RCA and one 1/4" auxiliary inputs

Three separate mixing/volume controls for MIC 1, MIC 2/AUX 1, and MIC 3/AUX 2

Treble and bass controls

MIC 1 input has priority

4-ohm and 8-ohm constant resistance output options

70-volt and 100-volt constant voltage output options

100 ~ 240 VAC, 50/60 Hz input voltage range

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 during normal business hours (Mon-Fri: 5am-7pm PT, Sat-

Sun: 9am-6pm PT) or via email at [email protected]

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 Commercial Audio 60-Watt 2-Channel 70V/100V Mixer Amplifier

1x User's Manual

PRODUCT OVERVIEW

Front Panel

1. MIC 1 Mixing/Volume Control

2. MIC 2/AUX 1 Mixing/Volume Control

3. MIC 3/AUX 2 Mixing/Volume Control

4. Bass Level Control

5. Treble Level Control

6. Master Volume Control

7. Power LED Indicator

8. Power Switch

Rear Panel

9. AC Power Cord

10. Speaker Terminals

11. AUX 2 Unbalanced RCA Input

12. AUX 2/MIC 3 Selector Switch

13. MIC 3 Unbalanced 1/4" Input

14. AUX 1 Unbalanced 1/4" Input

15. AUX 1/MIC 2 Selector Switch

16. MIC 2 Unbalanced 1/4" Input

17. MIC 1 Unbalanced 1/4" Input

CONSTANT VOLTAGE VS 8-OHM SPEAKER SYSTEMS

A constant voltage speaker system differs from a traditional 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. For example, if using a 100-watt amplifier, the total load from speakers should not

exceed 80 watts.

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.

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.

SAMPLE CONNECTION DIAGRAM

CONSTANT RESISTANCE INSTALLATION

Perform the following steps to install this amplifier in a 4-ohm or 8-ohm speaker

system.

1. Ensure that all equipment to be connected is powered off and unplugged from

its power source before making any electric/audio connections.

2. Place the amplifier in its intended location.

3. Using speaker wire (not included), create a speaker array with a 4-ohm or 8-ohm

overall load. This can be a single 4-ohm or 8-ohm speaker or a number of

speakers calculated to produce a 4-ohm or 8-ohm load.

For example, you could connect two 4-ohm speakers in series to create an 8-

ohm load. Alternatively, you can connect two 8-ohm speakers in series to create

a 16-ohm array, then connect a second 16-ohm array in parallel to the first to

create an overall 8-ohm speaker load. Speaker load calculators are available on

the internet to help with the math.

4. Connect the negative lead of the speaker wire to the COM terminal on the

amplifier, then connect the positive lead to either the 4-ohm or 8-ohm terminal,

depending on the overall impedance of your speaker array.

5. (Optional) Plug a dynamic microphone into the MIC 1 Input (17).

6. (Optional) Either plug a dynamic microphone into the MIC 2 Input (16) or plug a

line-level device, such as the headphone output of an mp3 player or

smartphone, into the AUX 1 Input (14). If using the MIC 2 Input, set the AUX

1/MIC 2 Switch (15) to the MIC 2 position, otherwise if using the AUX 1 Input, set

it to the AUX 1 position.

7. (Optional) Either plug a dynamic microphone into the MIC 3 Input (13) or plug a

line-level device, such as a CD player, into the AUX 2 Input (11). If using the MIC 3

Input, set the AUX 2/MIC 3 Switch (12) to the MIC 3 position, otherwise if using

the AUX 2 input, set it to the AUX 2 position.

8. Ensure that the Master Volume Control (6) is turned fully counterclockwise to

the minimum position.

9. Set the MIC 1 Mixing/Volume Control (1), the AUX 1/MIC 2 Mixing/Volume

Control (2), and the AUX 2/MIC 3 Mixing/Volume Control (3) knobs to the

midpoint.

10. Ensure that the Power Switch (8) is in the OFF position.

11. Plug the AC Power Cord (9) into a nearby AC power outlet, then flip the Power

Switch (8) to the ON Position.

12. Plug in and power on all connected equipment. Start audio playback as desired

on the various inputs.

13. Slowly increase the Master Volume Control (6) to comfortable volume level.

Adjust the appropriate Mixing/Volume Controls (1, 2, and 3) to balance the

inputs as desired.

Congratulations, your new amplifier is properly installed and operating!

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