The Monolith 7X 7-Channel 200-Watt Power Amplifier (Model 14566) is a high-performance audio component designed to deliver robust and clear sound for multi-channel home theater systems. This power amplifier features seven independent channels, each capable of delivering significant power to speakers, ensuring a dynamic and immersive audio experience.
Function Description:
The primary function of the Monolith 7X is to amplify line-level audio signals from a preamplifier or AV receiver and drive passive speakers. With seven independent amplifier modules, it is ideally suited for 7.1-channel audio systems. Each channel is designed to provide more than 200 watts of power into 8-ohm loads, ensuring ample headroom for demanding audio passages and efficient speaker operation. The amplifier includes a trigger input, allowing for remote power-on and power-off functionality when connected to a compatible source device. This feature enhances convenience by synchronizing the power state of the amplifier with other components in the audio system. Optically coupled protection circuits are integrated into each channel to safeguard both the amplifier and connected speakers from potential damage due to short circuits.
Important Technical Specifications:
- Model: 14566
- Number of Channels: 7
- EIA 1kHz Output Power at 8 Ohms*: 250 watts
- EIA 1kHz Output Power at 4 Ohms*: 375 watts
- FTC Full Bandwidth Output Power at 8 Ohms**: 200 watts
- FTC Full Bandwidth Output Power at 4 Ohms**: 300 watts
- Input Sensitivity for Full Rated Power: RCA Input: 1.49 Volts, XLR Input: 1.67 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: 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 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 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.
Usage Features:
The Monolith 7X offers flexible connectivity and control options:
- Inputs: Features both RCA and XLR line-level inputs for each of the seven channels, allowing connection to a dedicated preamplifier or AV receiver. An Input Select switch enables users to choose between RCA and XLR inputs.
- Outputs: Equipped with gold-plated 5-way binding posts for connecting speakers, ensuring secure and high-quality connections.
- Remote Power-On Trigger: A 3.5mm TS jack allows for connection to a source device's trigger output. The amplifier powers on when a voltage (3.3 to 24 VDC) is detected and enters standby mode when the signal is removed. This feature requires the Master Power switch on the rear panel to be ON and the front panel Power switch to be in the Standby position.
- Master Power Switch: Located on the rear panel, this switch applies or removes main power to the amplifier and also functions as a circuit breaker.
- Front Panel Power Switch: Controls the amplifier's state between standby mode and full power on.
- Ground (GND) Terminal: A chassis ground terminal is provided to help resolve hum issues that may arise from interconnected components.
- Power Input: Utilizes an IEC 60320 C20 panel connector for the included high-current AC power cable, which should be plugged directly into an AC wall outlet, not a switched outlet on another audio component.
- Speaker Wire Recommendations: For optimal performance, it is recommended to use at least 14AWG wire, preferably 12AWG or 10AWG, for speaker connections. Speaker wires should be of equal length for stereo pairs and identified for correct polarity (+/red and -/black). Excess wire should be snaked, not coiled, to prevent interference.
- Cable Preparation: Users should ensure that any cables run through walls, floors, or air ducts are appropriately rated (In-Wall, Riser, or Plenum) for safety and compliance.
- Installation Sequence: For safe operation and to prevent damage to speakers, it is recommended to power on the amplifier last and power it off first when operating the audio system. The amplifier's power button LED blinks during startup and illuminates steadily when ready for operation.
Maintenance Features:
- Protection Circuitry: Each channel incorporates an optically coupled protection circuit that cuts off audio output if a short circuit is detected on the speaker wires. The circuit automatically resets once the short is resolved.
- Main Circuit Breaker: The Master Power switch on the rear panel serves as a circuit breaker. If it trips, users can attempt to reset it. Persistent tripping indicates a need for professional service.
- Cleaning: The device should be cleaned using a soft, dry cloth. Chemical cleaners, solvents, or detergents should be avoided. For stubborn deposits, a cloth moistened with warm water can be used.
- User Serviceability: The device contains no user-serviceable parts. Users are advised not to attempt to open, service, or modify the amplifier to prevent electric shock and maintain warranty validity.
- Environmental Considerations: The amplifier is intended for indoor use only and should not be exposed to water, moisture, excessively high temperatures, direct sunlight, or areas with excessive dust, humidity, oil, smoke, or combustible vapors. Adequate airflow around the device is crucial to prevent overheating.
- Power Cord Care: The power cord should be protected from crimping, pinching, or tangling, and should not present a tripping hazard. The device requires a grounded power cord and a proper ground connection from the power source. The plug should not be modified, nor should a "cheater" plug be used.
- Physical Damage Check: Before operation, the unit and power cord should be inspected for physical damage. If damage is present, the device should not be used.
- Electrical Connections: All electrical connections should be made only after ensuring that power is turned off and disconnected.
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