MONOPRICE Commercial Audio 60-Watt 70V/100V Mixer Amplifier User Manual

MONOPRICE Commercial Audio 60-Watt
70V/100V Mixer Amplifier

P/N 1800
User Manual

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 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 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 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 Do not use in close, confined spaces.
• Prior to operation, check the unit and power cord for physical 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 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 Ensure that the power cord does not present a tripping hazard.
• Never unplug the unit by pulling on the power Always grasp the connector head.
• Ensure that power is turned off and disconnected before making any electrical connections.
• Clean using a soft, dry cloth Do not use chemical cleaners, solvents, or detergents. For stubborn deposits, moisten the cloth with warm water.
• This device has no user serviceable Do not attempt to open, service, or modify this device.
• Ensure that the terminal cover is installed over the speaker terminals before applying 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 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, 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.comduring normal business hours (Mon-Fri: 5 am-7 pm PT, Sat-Sun: 9 am-6 pm PT) or via email at support@monoprice.com

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

1. AC Power Cord
2. Speaker Terminals
3. AUX 2 Unbalanced RCA Input
4. AUX 2/MIC 3 Selector Switch
5. MIC 3 Unbalanced 1/4″ Input
6. AUX 1 Unbalanced 1/4″ Input
7. AUX 1/MIC 2 Selector Switch
8. MIC 2 Unbalanced 1/4″ Input
9. 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 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. Plugin and power on all connected Start audio playback as desired on the various inputs.

13. Slowly increase the Master Volume Control (6) too comfortable volume 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!

CONSTANT VOLTAGE INSTALLATION

Perform the following steps to install this amplifier with a 70-volt or 100-volt constant voltage speaker array.

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 using one or more 70- volt or 100-volt All speakers should be connected in parallel.

4. Set the wattage switches on the speakers to a value that is equal to or less than 48 watts in total (80% of the 60-watt amplifier power rating). For example, if you have 4 speakers, each one should be set to a value of 12 watts or less.
   Note that 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. Also note that the speakers do not have to be set to the same wattage value, but those set to higher wattage values will be louder than those set to lower values.

5. Connect the negative speaker wire lead to the COM terminal, then connect the positive lead to either the 70V or 100V terminal, depending on the types of speakers in the array.

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

7. (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.

8. (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.

9. Ensure that the Master Volume Control (6) is turned fully counterclockwise to the minimum position.

10. 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.

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

12. Plug the AC Power Cord (9) into a nearby AC power outlet, then flip the Power Switch (8) to the ON position.

13. Plug in and power on all connected Start audio playback as desired on the various inputs.

14. Slowly increase the Master Volume Control (6) to comfortable volume 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!

BLOCK DIAGRAM

SPECIFICATIONS

Inputs

| 3x 1/4″ unbalanced microphone 1x 1/4″ unbalanced auxiliary

1x RCA unbalanced auxiliary

Microphone Input Sensitivity| 5mV
Auxiliary Input Sensitivity| 350mV
Frequency Response| 80 Hz ~ 16 kHz (-3dB)
Signal-to-Noise Ratio| ≥ 75dB
Total Harmonic Distortion| ≤ 1%
Bass Tone Control| ± 10dB at 100 Hz
Treble Tone Control| ± 10dB at 10kHz
Priority Function| MIC 1 has priority
Protect Circuits| High temperature, overload, short circuit
Input Power| 120 VAC, 50/60 Hz
Power Consumption| 80 watts
Dimensions| 11.2″ x 7.4″ x 2.6″ (284 x 188 x 67 mm)
Weight| 7.7 lbs. (3.5 kg)

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.comduring regular business hours, 7 days a week. You can also get assistance through email by sending a message to tech@monoprice.com

REGULATORY COMPLIANCE

Notice for FCC

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 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.

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:

• Reorient or relocate the receiving
• Increase the separation between the equipment and
• Connect the equipment into an outlet on a circuit different from that to which the receiver is
• Consult the dealer or an experienced radio/TV technician for

Notice for Industry Canada

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

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