Marantz 661 MKII Manual

The Marantz 661 MKII is a high-performance audio amplifier featuring advanced amplification technology, multiple input/output options, precision tone controls, remote control operation, and premium build quality. Designed for audiophiles and home theater enthusiasts, it delivers exceptional sound quality with robust power output. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Operation Modes 8. Audio Settings 9. Care & Maintenance 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: High-power amplifier section, Remote Control, Multiple audio inputs, Speaker outputs, Headphone jack, Tone controls.

Feature	Description
Power Output	High-power amplification for superior audio performance
Audio Inputs	Multiple RCA and digital inputs for various sources
Speaker Outputs	Binding posts for speaker connections
Headphone jack	For private audio listening
AC power input	For power connection
Tone Controls	Bass and treble adjustment
Power Switch	Turns amplifier on/off
Input Selector	Selects between different audio sources
Volume Control	Adjusts audio output level
Remote Sensor	Receives signals from remote control

Installation

Unpack and inspect contents. Place on stable, well-ventilated surface.

Connect speakers: Use high-quality speaker cables to binding posts.
Connect audio sources: Use appropriate cables for CD players, turntables, etc.
Connect to AC power: Use provided power cable.
Ensure proper ventilation: Leave adequate space around unit.

WARNING! Unit contains high voltages; ensure proper grounding. Use qualified installer if unsure.

First-Time Setup

Power on amplifier; verify proper operation.

Input selection: Use INPUT selector to choose desired source.
Volume adjustment: Start with low volume and gradually increase.
Tone settings: Adjust bass and treble to personal preference.
Remote setup: Install batteries and test remote functions.

CAUTION! Ensure proper speaker impedance matching to prevent damage.

Specifications

Power Output: High-power amplification (specific wattage per model)
Frequency Response: 20Hz - 20kHz ±0.5dB
Total Harmonic Distortion: <0.05% at rated power
Inputs: Multiple RCA, digital coaxial, optical
Outputs: Speaker terminals, headphone, preamp out
Signal-to-Noise Ratio: >100dB
Power Requirements: 120V/230V AC, 50/60Hz
Dimensions: Standard component size
Weight: Substantial build quality

Controls and Settings

Front Panel: POWER, INPUT SELECTOR, VOLUME, TONE CONTROLS, HEADPHONE JACK.

Remote: POWER, INPUT SELECTION, VOLUME UP/DOWN, MUTE, TONE CONTROLS.

Audio Settings: Bass adjustment, Treble adjustment, Balance control, Direct mode. Input Selection: CD, AUX, TUNER, PHONO, TAPE. Display: Source indicator, Volume level, Status indicators.

Connecting Devices

Audio Sources: RCA inputs for various components. Speakers: Binding post outputs.

Turn off amplifier before connecting devices.
Match input types to source components.
Use high-quality cables for optimal performance.
Ensure secure connections to prevent signal loss.

Tip: Keep signal cables away from power cables to reduce interference.

Operation Modes

Supports various audio sources and listening modes.

Source Selection: Use INPUT selector for different audio sources.
Volume Control: Adjust to comfortable listening level.
Tone Adjustment: Fine-tune bass and treble as needed.
Direct Mode: Bypass tone controls for pure signal path.
Headphone Use: Connect headphones for private listening.
Remote Operation: Control all functions from listening position.

WARNING! Avoid extreme volume levels that could damage speakers or hearing.

Audio Settings

Tone Controls: Independent bass and treble adjustment. Balance: Left/right channel balance. Direct Mode: Pure audio path bypassing tone circuits.

Care & Maintenance

Unplug before cleaning. Use soft, dry cloth only; avoid chemicals.

CAUTION! Do not use liquid cleaners; ensure proper ventilation during operation.

Regulatory Information

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound output	Power/connections	Check power connection; verify input selection; check speaker connections.
Distorted sound	Overload/settings	Reduce volume level; check source quality; verify speaker impedance.
Remote not working	Batteries/obstacles	Replace batteries; ensure line of sight to sensor; check remote mode.
Hum or noise	Grounding/cables	Check ground connections; separate signal and power cables; verify cable quality.
Overheating	Ventilation	Ensure adequate ventilation; reduce volume if necessary; check ambient temperature.

Reset: Power cycle unit if issues persist.

Service: Contact authorized Marantz service center for technical support.