Marantz 4070 Manual

The Marantz 4070 is a high-performance stereo receiver featuring 70 watts per channel, AM/FM tuner with quartz PLL synthesizer, multiple audio inputs, phono input for turntables, tape monitoring, loudness control, and advanced tone controls. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Stereo receiver with AM/FM tuner, multiple audio inputs, speaker outputs, remote control capability.

Feature	Description
Power Output	70 watts per channel (8 ohms)
Tuner Section	AM/FM with quartz PLL synthesizer
Phono Input	MM cartridge compatible
Tape Monitoring	Dual tape decks with dubbing
Tone Controls	Bass, treble, midrange adjustment
Loudness Control	Compensates for low volume listening
Speaker Selector	A/B speaker switching
Headphone Jack	Front panel 1/4" stereo jack
Remote Control	Optional RC-5 compatible
Power Supply	120V AC, 60Hz operation

Installation

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

1. Connect speakers: Use speaker wire to connect to A/B speaker terminals.
2. Connect audio sources: Use appropriate inputs for turntable, CD player, tape deck.
3. Connect antenna: AM loop antenna and FM dipole antenna included.
4. Plug into AC power outlet.

WARNING! Ensure proper ventilation; do not block heat sinks. Use correct speaker impedance.

First-Time Setup

Power on receiver; initialize settings.

1. Set input selector: Choose appropriate source (Phono, CD, Tuner, etc.).
2. Tuner setup: Extend FM antenna; auto-scan for stations.
3. Speaker configuration: Select A/B speakers as needed.
4. Tone controls: Adjust to personal preference.

CAUTION! Keep away from moisture and heat sources. Allow proper ventilation.

Specifications

• Power Output: 70W + 70W (8 ohms, 20Hz-20kHz)
• Total Harmonic Distortion: 0.02%
• Frequency Response: 10Hz-50kHz (+1/-3dB)
• Input Sensitivity: Phono: 2.5mV, CD: 200mV
• Signal-to-Noise Ratio: Phono: 86dB, CD: 100dB
• Tuner Section: FM stereo, AM broadcast
• Dimensions: 17-1/8" W × 5-1/4" H × 14-3/4" D
• Weight: 22 lbs
• Power Requirements: 120V AC, 60Hz, 350W

Controls and Settings

Front panel: Power switch, input selector, volume control, tone controls, balance, loudness.

Input Selection: Phono, CD, Tuner, Aux, Tape 1, Tape 2. Tone Controls: Bass ±10dB, Treble ±10dB. Speaker Selection: A/B speakers on/off. Loudness: Compensates for Fletcher-Munson curve.

Connecting Devices

Multiple audio inputs for various sources.

1. Turntable: Connect to Phono input using RCA cables.
2. CD Player: Use CD input with RCA cables.
3. Tape Deck: Connect to Tape 1/2 inputs and outputs.
4. Speakers: Connect to A/B speaker terminals observing polarity.

Tip: Use high-quality cables for best audio performance. Keep signal cables away from power cords.

Tuner Operation

AM/FM tuner with quartz PLL synthesizer.

1. Select Tuner input on front panel.
2. Press FM/AM button to select band.
3. Use tuning knob or auto-scan to find stations.
4. Store presets: Hold memory button, select preset number.
5. Recall presets: Press preset buttons directly.

WARNING! Ensure proper antenna connection for best reception. Position FM antenna vertically.

Audio Features

Advanced audio processing and controls.

Tone Controls: Bass, treble adjustment. Loudness Control: Enhances bass at low volumes. Tape Monitoring: Monitor and dub between tape decks. Speaker Selection: A/B speakers independently controlled.

Care & Maintenance

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

CAUTION! Do not use chemical cleaners. Keep ventilation openings clear of dust.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits. Copyright © Marantz. For support, visit www.marantz.com or contact authorized service centers.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound	Speaker connections/input selection	Check speaker wires; verify input selection; ensure volume up.
Distorted sound	Overload/clipping	Reduce volume; check source level; verify speaker impedance.
Poor FM reception	Antenna positioning	Reposition FM antenna; ensure proper connection.
Hum or noise	Grounding/cables	Check ground connections; separate audio and power cables.
Unit overheats	Ventilation blockage	Ensure adequate ventilation; clear obstructions from vents.

Reset: Power cycle unit if issues persist.

Service: Contact authorized Marantz service center for repairs.