Marantz 3650 Owners Manual

The Marantz 3650 is a high-performance stereo preamplifier featuring advanced audio circuitry, multiple input/output options, precision tone controls, and professional-grade construction. Designed for audiophiles and professional audio applications, it offers exceptional sound quality with low distortion and wide frequency response. Below are key sections covering features, installation, operation, specifications, and maintenance.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Components 7. Operation Guide 8. Maintenance 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: High-grade preamplifier circuitry, multiple input/output jacks, precision volume control, tone controls, and selector switches.

Feature	Description
Input Selector	Multiple source selection (Phono, Tuner, Aux, Tape)
Phono Input	MM/MC cartridge compatibility with adjustable loading
Tone Controls	Bass and treble adjustment with defeat switch
Volume Control	Precision stepped attenuator for accurate level setting
Output Jacks	Main outputs and tape monitor loops
Power Supply	Dedicated linear power supply for clean operation
Balance Control	Left/right channel balance adjustment
Loudness Control	Compensates for Fletcher-Munson curves
Muting Switch	Instantaneous audio muting
Power Switch	Main power on/off control

Installation

Unpack and inspect contents. Place on stable, level surface away from heat sources.

Connect audio sources: Use appropriate input jacks for turntable, tuner, CD player, etc.
Connect to power amplifier: Use main output jacks to amplifier inputs.
Connect tape deck: Use tape monitor jacks for recording/playback.
Plug into AC power outlet.

WARNING! Ensure proper ventilation; do not stack other components directly on top. Use proper audio cables for optimal performance.

First-Time Setup

Power on unit; allow warm-up time for optimal performance.

Source selection: Rotate input selector to desired source (Phono, Tuner, Aux, Tape).
Volume adjustment: Set volume to minimum before playing audio.
Tone controls: Adjust bass and treble to preference or use tone defeat.
Balance control: Center for equal left/right channel output.

CAUTION! Always turn volume to minimum when switching sources or turning system on/off to prevent speaker damage.

Specifications

Frequency Response: 10Hz - 100kHz (+0/-3dB)
Total Harmonic Distortion: <0.005% (1kHz)
Input Sensitivity: Phono: 2.5mV, Line: 150mV
Signal-to-Noise Ratio: >90dB (line inputs)
Input Impedance: Phono: 47kΩ, Line: 50kΩ
Output Level: 1V RMS (maximum)
Tone Control Range: ±10dB at 100Hz and 10kHz
Power Requirements: 120V AC, 60Hz, 15W
Dimensions: 17" W × 4" H × 12" D
Weight: 12 lbs

Controls and Settings

Front panel controls: Power switch, Input selector, Volume, Balance, Bass, Treble, Tone defeat, Loudness, Mute.

Rear Panel: Input jacks (Phono, Tuner, Aux, Tape), Output jacks (Main, Tape out), AC power cord.

Input Selection: Rotate selector knob to choose between Phono, Tuner, Aux 1, Aux 2, Tape. Tone Controls: Bass (±10dB at 100Hz), Treble (±10dB at 10kHz) with defeat switch. Loudness: Compensates for low-volume listening. Muting: Instant audio cut-off for telephone use.

Connecting Components

Turntable: Connect to Phono inputs. CD Player/Tuner: Connect to Aux or Tuner inputs. Tape Deck: Connect to Tape monitor jacks. Power Amplifier: Connect to Main outputs.

Turn off all components before making connections.
Use high-quality shielded audio cables.
Match cable colors (red-right, white-left) where applicable.
Ensure firm connection of RCA plugs.

Tip: Keep signal cables away from power cords to minimize hum and interference.

Operation Guide

Designed for precise audio control and signal routing.

Power on: Switch power button; indicator light illuminates.
Select source: Rotate input selector to desired audio source.
Adjust volume: Gradually increase from minimum setting.
Tone adjustment: Use bass/treble controls or engage tone defeat.
Balance control: Adjust for optimal stereo image.
Loudness control: Engage for enhanced low-volume listening.
Mute function: Press mute for temporary silence.
Tape monitoring: Use tape monitor switch for recording/playback.

WARNING! Do not operate with cover removed. Avoid excessive volume levels that could damage speakers.

Maintenance

Unplug before cleaning. Use soft, dry cloth for exterior; compressed air for control cleaning.

CAUTION! Do not use liquid cleaners or solvents. Internal servicing should be performed by qualified technician only.

Regulatory Information

FCC Part 15: Class A digital device; complies with interference limits. Manufactured to meet industry standards for audio equipment. Copyright © Marantz; all rights reserved. For technical support, contact authorized Marantz service centers or visit www.marantz.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound output	Incorrect connections/power	Check all cable connections; verify power is on; check input selection.
Hum or noise	Grounding issues/cables	Ensure proper grounding; check cable quality and routing.
Distorted sound	Overload/component issue	Reduce input level; check source components; verify proper loading.
Intermittent operation	Loose connections/controls	Check all connections; clean controls with contact cleaner.
One channel silent	Balance setting/cable	Check balance control; verify cable connections; swap cables to test.

Service: Contact authorized Marantz service center for internal repairs.

Support: www.marantz.com or consult your local Marantz dealer.