Marantz PM-52 Manual

The Marantz PM-52 is a high-quality stereo integrated amplifier featuring 60 watts per channel, MM phono input, CD direct input, tone controls, loudness compensation, A/B speaker switching, and headphone output. Designed for audiophile performance with gold-plated connectors, aluminum front panel, and remote control capability. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: High-current power amplifier, MM phono stage, gold-plated RCA connectors, aluminum chassis, front panel controls, remote sensor.

Feature	Description
Power Output	60 watts per channel (8 ohms, 20Hz-20kHz)
Phono Input	MM cartridge compatible
CD Direct	Bypasses tone controls for pure signal path
Speaker Switching	A/B speaker selection
Tone Controls	Bass and treble adjustment
Loudness	Volume-dependent bass compensation
Headphone Output	Front panel 1/4" jack
Remote Control	Infrared remote operation
Power Consumption	240 watts maximum
Dimensions	440mm wide × 121mm high × 315mm deep

Installation

Unpack and inspect contents. Place on stable, level surface with adequate ventilation.

1. Connect speakers: Use high-quality speaker cable to A or B terminals.
2. Connect audio sources: Turntable to PHONO, CD player to CD, tape deck to TAPE.
3. Connect power cord: Plug into AC outlet last.
4. Ensure proper ventilation: Leave 10cm clearance on all sides.

WARNING! Do not connect speakers while amplifier is powered on. Ensure proper grounding.

First-Time Setup

Power on amplifier; allow 30 seconds for stabilization.

1. Speaker selection: Press A or B speaker buttons as needed.
2. Source selection: Rotate INPUT selector to desired source.
3. Volume adjustment: Start with volume at minimum, gradually increase.
4. Tone controls: Set to flat position (12 o'clock) initially.
5. Loudness: Engage for low-volume listening if desired.

CAUTION! Avoid maximum volume settings to prevent speaker damage.

Specifications

• Power Output: 60W + 60W (8Ω, 20Hz-20kHz, 0.02% THD)
• Frequency Response: 5Hz-50kHz (+0/-3dB)
• Total Harmonic Distortion: 0.02% (20Hz-20kHz at rated power)
• Input Sensitivity: PHONO: 2.5mV, CD: 150mV, TAPE: 150mV
• Signal-to-Noise Ratio: PHONO: 80dB, CD: 100dB
• Tone Control Range: Bass: ±8dB at 100Hz, Treble: ±8dB at 10kHz
• Power Requirements: AC 120V, 60Hz (US model)
• Weight: 8.5 kg
• Remote Control: RC-2000AS (optional)

Controls and Settings

Front Panel: POWER, VOLUME, INPUT SELECTOR, BASS, TREBLE, LOUDNESS, SPEAKER A/B, HEADPHONE.

Rear Panel: PHONO, CD, TAPE, AUX inputs; SPEAKER A/B terminals; AC power inlet.

Tone Controls: Bass and treble adjustment (±8dB). Loudness: Compensates for Fletcher-Munson effect. Speaker Selection: A, B, or A+B speaker outputs. Input Selection: PHONO, CD, TAPE, AUX. Volume: Logarithmic potentiometer.

Connecting Devices

PHONO: Turntable with MM cartridge. CD: CD player or transport. TAPE: Tape deck with record/playback. AUX: Additional audio source.

1. Turn off amplifier before connecting devices.
2. Use high-quality RCA interconnects.
3. Match left/right channels (white/red).
4. Connect turntable ground wire to ground terminal.
5. Select appropriate input on front panel.

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

Operation Guide

Basic operation procedures for optimal performance.

1. Power sequence: Turn on sources first, then amplifier.
2. Volume control: Start low, increase gradually to desired level.
3. Source switching: Always lower volume when changing inputs.
4. Tone adjustment: Use sparingly; flat setting for most accurate reproduction.
5. Headphone use: Automatically mutes speaker outputs.
6. Speaker selection: A for main, B for remote, A+B for both.

WARNING! Never operate without proper load (speakers connected).

Advanced Features

CD Direct: Bypasses tone circuit for purer signal path. Loudness Compensation: Automatic bass boost at low volumes. Phono Stage: High-quality moving magnet preamplifier.

Care & Maintenance

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

CAUTION! Do not use solvents or abrasive cleaners. Keep ventilation openings clear.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits. Copyright © Marantz. For support, contact authorized Marantz service centers. Manufactured under license from Marantz Japan.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound	Speaker connections/input selection	Check speaker wires; verify input selection; ensure volume up.
Distorted sound	Overload/damaged speakers	Reduce volume; check speaker impedance; inspect speakers.
Hum/buzz	Grounding issues/cable placement	Ensure turntable ground connected; separate signal/power cables.
One channel dead	Cable/connection issue	Swap L/R cables to isolate problem; check balance control.
Overheating	Insufficient ventilation/overload	Ensure adequate clearance; check speaker impedance; reduce volume.

Reset: Power cycle amplifier if abnormal operation occurs.

Service: Contact authorized Marantz service center for repairs.