Monoprice 114566 Monolith Multi-Channel Power Amplifier User’s Manual

Monoprice 114566 Monolith Multi-Channel Power Amplifier

SAFETY WARNINGS AND GUIDELINES

• 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.
• Prior to operation, check the unit and power cord for physical damage. Do not use if physical damage has occurred.
• 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.
• 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.
• Ensure that power is turned off and disconnected before making any electrical connections.
• Do not plug this device into the switched output of a preamplifier or other audio component. This amplifier requires higher current levels than these devices are designed to handle.
• Unplug this device from the power source when not in use.
• Never unplug the unit by pulling on the power cord. Always grasp the connector head or adapter body.
• 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.

INTRODUCTION

Thank you for purchasing this Monolith 7-Channel 200-Watt Power Amplifier! This power amplifier features seven independent channels, each capable of delivering more than 200 watts of power into 8-ohm loads. A trigger input jack allows for remote power on/power off when a source device is powered on. Each channel features an optically coupled protection circuit, to prevent damage to the amplifier or speakers.

FEATURES

• Seven independent 200-watt into 8 ohms amplifier modules
• 20Hz ~ 20kHz ±0.1dB frequency response
• Gold-plated RCA input and speaker output connectors
• Remote power-on trigger option
• Rated for 4 ~ 16-ohm loads
• Optically coupled short circuit protection

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: 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 Monolith 7x 200-watt power amplifier
• 1x AC power cord (NEMA 5-15 to IEC 60320 C19) 1x
• User’s manual

PRODUCT OVERVIEW

• INPUT 1-7: RCA and XLR line-level inputs for connection to the preamplifier outputs on a dedicated preamplifier or AV receiver. The Input Select switch switches between the RCA and XLR inputs.
• TRIGGER INPUT: 3.5mm TS jack for connection to the trigger output of a source device. The presence of voltage on this input will cause the amplifier to power on. The amplifier will automatically power down into standby mode after the trigger signal has been removed.
• OUTPUT 1-7: Paired 5-way binding posts for connecting the speakers.
• POWER INPUT: The IEC 60320 C20 panel connector connects to the included high-current AC power cable.
• MASTER POWER: The Master Power switch is used to apply or remove power to the amplifier. By contrast, the Power switch on the front panel is used to switch the amplifier between standby mode and full power on.
• GND: Chassis ground. While a grounding wire is rarely needed, occasionally there is a hum issue when components are interconnected. This can be remedied by tying their chassis grounds together.

POWER SWITCH (Front Panel, not pictured): Switches the amplifier between standby mode and full power on.

CABLE PREPARATION

You will need several cables for this installation. None of the cables or connectors mentioned in this section are included in the system. Important Safety Note! If you plan on running any of these cables through the walls, through a connecting floor, or inside an air duct, they should be rated for In-Wall, Riser (between floors), or Plenum (air duct) use in commercial installations. For residential installations, an In-Wall rating is sufficient for all circumstances. Using unrated or improperly rated cables could accelerate the spread of any fire and could nullify insurance claims.

Speaker Wires

You will need seven-speaker wires to connect each speaker to the amplifier. The size (AWG) of the wire you choose depends on the distance from the amplifier to the speakers, the speaker impedance, and the physical limits of the terminals at each end. Other than saving a few pennies of cost or grams of weight per foot, there is no reason to use anything other than the thickest wire possible. This amplifier uses 5-way binding post connectors, which can accept bare wire, spade lugs, banana plugs, and pin plugs. For anything other than extremely short speaker wire runs, you should use at least 14AWG wire, but preferably 12AWG or 10AWG, depending on which gauges your speakers can accept. Whichever speaker wire you get, make sure that it has marks to identify one conductor from another. Most speaker wire uses a colored stripe to identify one of the conductors. The identified conductor is usually used for the positive (+/red) connection and the other for the negative (-/black) side.

Note: When cutting speaker wire, ensure that the length of each stereo pair is the same. This ensures that the overall impedance of each paired channel is identical. If there is any excess speaker wire, it should not be coiled, as it could create an antenna to receive stray radio signals. Instead, snake the excess wire back and forth.

RCA or XLR Cables

You will need seven single RCA or XLR cables to connect the preamp outputs on your preamplifier to the inputs on this amplifier. In most cases, ordinary RCA cables are sufficient. However, if there is a significant distance between the amplifier and the preamplifier, it is recommended to use RCA cables manufactured using shielded RG6 or RG59 cables. For long-distance cable runs, balanced XLR cables are highly recommended.

Trigger Cables

This amplifier features a low-voltage trigger input, which can switch the amplifier from standby mode into full power-on mode whenever the trigger signal is detected. The trigger signal consists of a low-current, low-voltage signal (between 3.3 and 24 VDC) applied to the input, which is carried between components with a cable that terminates in a 3.5mm TS plug.

REMOTE POWER ON

• This amplifier features a trigger input, which is used to switch the amplifier between standby mode and full power-on mode. The input is a 3.5mm TS jack that accepts a voltage level from 3.3 to 24 VDC. Some source devices feature a trigger output, which can be used to trigger the amp.
• If your source device does not contain a trigger output but does have a switched AC outlet, you can obtain a trigger adapter, which consists of an AC adapter with a 3.5mm TS plug on the end of the cord. This adapter can then provide the necessary trigger signal whenever the component it is plugged into is turned on.
• To use the amplifier with remote power on, the Master Power switch on the rear panel should be in the ON position, and the Power switch on the front panel in the Standby position.
• To override the remote power-on feature or to use the amp without it, simply use the Power switch on the front panel to turn the amp on and off (standby).

INSTALLATION

Perform the following steps to install this amplifier into a 7.1-channel audio system.

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

2. Prepare seven lengths of speaker wire (not included) to connect each of the seven output channels to its respective speaker.

3. Using a two-conductor speaker wire, connect one end to the input terminals on the speaker, then connect the other end to the Output terminals on the amplifier. Take care to maintain polarity with positive to positive and negative to negative.

4. Repeat step 3 for each of the other six speakers.

5. Using a single RCA interconnect cable (not included), plug one end into the Input on the amplifier, then plug the other end into the preamplifier output of the same name.
   Example: Connect the Center channel input on the amplifier to the Center channel output on the preamplifier.

6. Repeat step 5 for each of the other six channels.

7. (Optional) Using a two-conductor 3.5mm TS cable (not included), plug one end into the Trigger Input on the amplifier, then plug the other end into the trigger output on your source device.

8. Ensure that the Master Power switch is in the OFF position and that the Power switch is in the Standby position.

9. Using the included AC power cable, plug the C19 connector on the cable into the C20 panel connector on the amplifier, then plug the other end into a nearby AC power source.
   Warning! Do not plug the amplifier into a switched outlet on a preamplifier or other audio component. The amplifier should be plugged directly into an AC wall outlet.

10. Ensure that the volume on the preamplifier is set to the minimum level.

11. Power on all equipment connected to the amplifier, then press the Master Power button on the amp to power it ON. The power button LED will blink until the circuitry is properly warmed up. Once the LED stops blinking and illuminates steadily, the amplifier has finished the start-up process and is ready for operation.

Note: It is recommended to always turn the amplifier on last and to turn it off first whenever powering your audio system on or off. This ensures that any pops or transient spikes, which could cause damage to the delicate speaker coils, are not sent to your speakers.

Congratulations, your amplifier is connected and ready for use!

MAIN CIRCUIT BREAKER

The Master Power switch on the rear panel doubles as a circuit breaker. If the circuit breaker trips into the off position, try flipping it back on. If it immediately trips back off, unplug the amplifier from the power source and have it serviced.

PROTECTION CIRCUITRY

If the amplifier senses a short on one of the speaker wires the built-in protection circuit will cut off audio output. The circuit will continue to monitor the line and will stay cut off as long as the short continues to exist. If this occurs, inspect the speaker wire connections at each end and fix any shorts that exist. Once the short is repaired, the amplifier will continue to operate as normal.

TROUBLESHOOTING

1. The amplifier will not power on.
   Verify that the Master Power switch on the rear panel is in the ON position. Check to ensure that the AC power cord is fully plugged in at each end. Verify that the AC power outlet is live by plugging in another device, such as a lamp.

2. Audio from some channels, but not others.
   Try swapping the speaker from a good channel to the output of the bad channel to see if the problem is with the input or output. Check that the RCA input cable is firmly seated on the connector at each end. Try swapping out the input RCA cable with a known good cable. Check the speaker wire connections at each end. Try swapping out the speaker wire with a known good one.

3. The audio plays and then cuts off.
   Check the speaker wire connections for stray wire strands, which could cause a short circuit.

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

SPECIFICATIONS

Volts
Frequency Response at Rated Output| 20Hz ~ 20kHz ±0.1dB
Phase Response| +5 to -15 degrees from 20Hz to 20kHz at 1 watt
Signal-to-Noise Ratio “A-Weighted”| Greater than 110dB below rated FTC Full Bandwidth Power
Total Harmonic Distortion (THD)| Less than 0.03% at full rated FTC power Less than 0.005% at full EIA power at 1kHz
Intermodulation Distortion (IMD)| Less than 0.03% at full rated FTC power Less than 0.005% at full EIA power at 1kHz
Load Impedance| Safe with all types of loads Rated for 4 to 16 ohms
Power Bandwidth| FTC +0-3db from 5Hz ~ 100kHz
Damping Factor| Greater than 400 from 10Hz ~ 400Hz
Crosstalk| Greater than –100dB from 20Hz ~ 20kHz
Gain| The voltage gain of +28dB (XLR) or +28.5dB (RCA)
Slew Rate| > 50V/µs
Input Impedance| 28 kilohms (nominal)
---|---
Remote Trigger Voltage| 3.3 ~ 24 VDC at 5mA or greater
DC Output Offset| Less than ±5mV
Input Power| 120 VAC (nominal)
Chassis Dimensions| 17.0″ x 7.0″ x 16.5″ (432 x 178 x 419 mm)
Net Weight| 93.2 lbs. (42.3kg)

• EIA 1kHz Power refers to the maximum average power in watts RMS at 1kHz with 1% THD +N. This test is performed with one channel at this maximum power with all other channels driven to 1/8th power.
• FTC Full Bandwidth Power refers to the maximum average power in watts RMS from 20Hz to 20kHz with 0.03% THD+N. This test is performed with all channels driven to full power.

FREQUENTLY ASKED QUESTIONS

What is the Monoprice 114566 Monolith Multi-Channel Power Amplifier?

The Monoprice 114566 Monolith Multi-Channel Power Amplifier is a high-quality audio amplifier designed to power multiple channels or speakers in a home theater or audio system setup.

How many channels does the Monoprice 114566 amplifier support?

The Monoprice 114566 amplifier supports multiple channels, typically ranging from 3 to 7 channels, depending on the specific model you choose.

What is the power output of the Monoprice 114566 amplifier?

The power output of the Monoprice 114566 amplifier varies depending on the specific model, but it is known for delivering high power levels to each channel, ensuring robust and dynamic audio performance.

Can I use the Monoprice 114566 amplifier with any audio system?

Yes, the Monoprice 114566 amplifier is compatible with various audio systems, including home theaters, multi-room audio setups, and stereo systems, as long as the system supports the required number of channels.

Does the Monoprice 114566 amplifier support different audio formats?

Yes, the Monoprice 114566 amplifier supports various audio formats commonly used in home theater systems, such as Dolby Digital, DTS, and PCM.

Does the Monoprice 114566 amplifier have built-in audio processing features?

No, the Monoprice 114566 amplifier is primarily a power amplifier and does not include built-in audio processing features. It is meant to be used in conjunction with an audio processor or AV receiver.

Can I connect the Monoprice 114566 amplifier to my AV receiver?

Yes, you can connect the Monoprice 114566 amplifier to your AV receiver using RCA or XLR cables, depending on the input options available on the amplifier and receiver.

Does the Monoprice 114566 amplifier have balanced inputs?

Yes, the Monoprice 114566 amplifier offers balanced XLR inputs for improved noise rejection and signal quality, in addition to unbalanced RCA inputs.

Is the Monoprice 114566 amplifier bridgeable?

No, the Monoprice 114566 amplifier is not bridgeable. Each channel operates independently, and bridging is not supported.

Does the Monoprice 114566 amplifier have a cooling system?

Yes, the Monoprice 114566 amplifier features a robust cooling system, usually consisting of large heat sinks and cooling fans, to dissipate heat generated during operation.

Can I connect multiple speakers to each channel of the Monoprice 114566 amplifier?

Yes, you can connect multiple speakers to each channel of the Monoprice 114566 amplifier by using speaker selectors or distribution amplifiers, as long as the total impedance does not go below the amplifier's minimum rating.

Does the Monoprice 114566 amplifier support bi-amping or tri-amping configurations?

Yes, the Monoprice 114566 amplifier supports bi-amping or tri-amping setups, allowing you to dedicate separate amplifier channels to specific frequency ranges of a speaker.

Can I use the Monoprice 114566 amplifier in a professional audio setup?

Yes, the Monoprice 114566 amplifier can be used in professional audio setups, such as in recording studios or small-scale sound reinforcement systems, where multiple channels of amplification are required.

Does the Monoprice 114566 amplifier support 4-ohm or 8-ohm speakers?

The Monoprice 114566 amplifier supports both 4-ohm and 8-ohm speakers. It is designed to handle a wide range of speaker impedance ratings.

Is the Monoprice 114566 amplifier rack-mountable?

Yes, the Monoprice 114566 amplifier is rack-mountable, featuring a standard 19-inch rack width. Rack-mount ears or brackets may need to be purchased separately.

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