Marantz 4400 Owners Manual

The Marantz 4400 is a classic stereo receiver from the 1970s featuring quadraphonic sound, 40 watts per channel, built-in Dolby noise reduction, multiple input/output options, wood grain cabinet, and advanced tuning capabilities. Below are key sections for safety, features, installation, setup, operation, and maintenance.

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

Features at a Glance

Key components: Quadraphonic decoder, Dolby noise reduction, wood grain cabinet, tuning meter, multiple speaker outputs, and comprehensive input/output panel.

Feature	Description
Power Output	40 watts per channel (4 channels)
Quadraphonic Decoder	Built-in SQ and CD-4 compatibility
Dolby Noise Reduction	Reduces tape hiss and background noise
Tuning Meter	Precision tuning indicator
Speaker Outputs	Front and rear speaker connections
Input Selector	Phono, Aux, Tape 1, Tape 2
Loudness Control	Compensates for low volume listening
Tone Controls	Bass, Midrange, Treble adjustments
Headphone Jack	For private listening
Wood Cabinet	Walnut wood grain finish

Installation

Unpack and inspect contents. Place on stable, level surface.

Connect speakers: Match impedance requirements (4-16 ohms).
Connect audio sources: Turntable to Phono, CD player to Aux.
Connect tape decks: Use Tape 1/Tape 2 inputs and outputs.
Plug into AC power outlet.
Connect antenna for FM/AM reception.

WARNING! Ensure proper ventilation; do not block ventilation slots. Keep away from heat sources.

First-Time Setup

Power on receiver; allow 30 seconds for warm-up.

Set input selector to desired source (Phono, Aux, Tape).
Adjust volume to minimum before playing audio.
Tune FM/AM: Use tuning knob and meter for optimal reception.
Set tone controls to flat position for initial listening.
Configure quadraphonic mode if using 4-channel sources.

CAUTION! Do not operate with speaker wires touching each other or chassis.

Specifications

Power Output: 40 watts RMS per channel (4 channels)
Total Harmonic Distortion: Less than 0.3%
Frequency Response: 20Hz - 20kHz ±1dB
Input Sensitivity: Phono: 2.5mV, Aux: 150mV
Signal-to-Noise Ratio: 65dB (Phono)
Speaker Impedance: 4-16 ohms
Tuning Range: FM 88-108MHz, AM 530-1600kHz
Dimensions: 19" W × 6" H × 15" D
Weight: 28 lbs
Power Requirements: 120V AC, 60Hz, 250W

Controls and Settings

Front Panel: Power switch, Input selector, Volume, Balance, Tone controls, Loudness, Mode selector, Tuning knob.

Rear Panel: Speaker terminals, Input/output jacks, Antenna terminals, AC power cord.

Tone Controls: Bass (±10dB at 100Hz), Midrange (±8dB at 1kHz), Treble (±10dB at 10kHz). Mode Selector: Stereo, Mono, Reverse, Quadraphonic. Input Selector: Phono, Aux, Tape 1, Tape 2. Balance: Controls left/right channel balance.

Connecting Devices

Phono: Connect turntable ground wire. Aux: CD player, tuner. Tape: Record/playback decks.

Turn off power before making connections.
Use proper cables: RCA for line level, ground wire for turntable.
Connect speakers observing correct polarity.
Select appropriate input source on front panel.

Tip: Keep signal cables away from power cords to avoid hum.

Operation Guide

Supports stereo and quadraphonic playback.

Power on: Allow 30-second warm-up for optimal performance.
Select input: Choose Phono, Aux, or Tape source.
Adjust volume: Start at minimum, increase gradually.
Tune radio: Use tuning meter for precise station selection.
Engage Dolby: For tape playback with Dolby encoding.
Set quadraphonic mode: For 4-channel sources.
Use tone controls: Adjust to room acoustics and personal preference.
Monitor speakers: Check for proper operation from all channels.

WARNING! Do not operate at maximum volume for extended periods.

Quadraphonic Setup

Four-channel sound reproduction for immersive audio experience.

Connect four speakers: Front left/right, rear left/right.
Select quadraphonic mode on front panel.
Use compatible sources: SQ-encoded records or CD-4 discs.
Adjust rear channel level for proper sound field.
Test with quadraphonic test record or source material.

Note: Ensure all four speakers are properly phased and positioned.

Care & Maintenance

Unplug before cleaning. Use soft, dry cloth for exterior. Clean controls with contact cleaner if needed.

CAUTION! Do not use solvents or abrasive cleaners. Keep away from moisture and extreme temperatures.

Regulatory Information

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound	Speaker connections/power	Check speaker wires; verify power; check input selection
Hum or buzz	Grounding issues	Connect turntable ground; check cable routing
Weak FM reception	Antenna alignment	Adjust FM antenna; check connections
Distorted sound	Overload/clipping	Reduce volume; check source level
One channel silent	Balance control/cables	Adjust balance; check RCA cables
Lights not working	Bulbs/fuses	Replace indicator bulbs; check internal fuses

Service: Contact authorized Marantz service center for internal repairs.

Note: This vintage equipment may require specialized service.