Marantz PM 45 Manual

The Marantz PM 45 is a high-quality stereo integrated amplifier featuring 60 watts per channel, MM phono input, CD direct input, tone controls, loudness compensation, speaker A/B switching, and headphone output. With its classic Marantz design and robust construction, it delivers exceptional audio performance for home stereo systems. 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 Audio Sources 7. Operation Guide 8. Maintenance 9. Regulatory Information 10. Troubleshooting

Features at a Glance

Key components: Power amplifier section, preamplifier controls, input selector, speaker switching, headphone output.

Feature	Description
Power Output	60 watts per channel (8 ohms)
Phono Input	MM cartridge compatible
CD Direct	Direct path for CD players
Tone Controls	Bass and treble adjustment
Loudness	Frequency compensation at low volumes
Speaker Switching	A/B speaker selection
Headphone Output	Standard 1/4" jack
Input Selector	Phono, CD, Tuner, Aux, Tape
Power Switch	Main power on/off
Volume Control	Master volume adjustment

Installation

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

Connect speakers: Use speaker wire to connect to A or B terminals, observing polarity.
Connect audio sources: Use RCA cables for phono, CD, tuner, aux inputs.
Connect tape deck: Use tape monitor loop for recording/playback.
Plug into AC power outlet.

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

First-Time Setup

Power on amplifier; set initial controls.

Set volume to minimum: Turn volume knob fully counterclockwise.
Select input source: Choose appropriate input (Phono, CD, etc.).
Adjust tone controls: Set bass and treble to neutral (12 o'clock position).
Select speakers: Choose A, B, or A+B speaker outputs.

CAUTION! Always turn volume down before powering on or changing sources.

Specifications

Power Output: 60W + 60W (8 ohms, 20Hz-20kHz)
Total Harmonic Distortion: 0.02%
Frequency Response: 5Hz-50kHz (+0/-3dB)
Input Sensitivity: Phono: 2.5mV, CD: 150mV
Signal-to-Noise Ratio: Phono: 80dB, CD: 100dB
Tone Control Range: ±8dB at 100Hz (bass), ±8dB at 10kHz (treble)
Power Requirements: 120V AC, 60Hz
Dimensions: 440mm width × 125mm height × 345mm depth
Weight: 8.5 kg

Controls and Settings

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

Rear Panel: AC power input, phono ground, input jacks, speaker terminals, tape monitor.

Input Selection: Phono (MM), CD, Tuner, Aux, Tape. Tone Controls: Bass (±8dB at 100Hz), Treble (±8dB at 10kHz). Loudness: Compensates for Fletcher-Munson curves. Balance: Adjusts left/right channel balance. Speaker Selection: A, B, A+B, or off.

Connecting Audio Sources

Phono: Connect turntable to phono inputs, attach ground wire. CD: Use CD input for direct connection. Tuner: Connect radio tuner. Aux: For additional line-level sources. Tape: Use tape monitor for recording decks.

Turn off amplifier before connecting sources.
Use quality RCA cables for all connections.
Ensure phono ground is connected for turntables.
Match input selector to connected source.

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

Operation Guide

Basic operation procedures for optimal performance.

Power on: Switch power button; wait for relay click.
Select source: Choose appropriate input selector position.
Adjust volume: Start at low volume and increase gradually.
Use tone controls: Adjust bass and treble to preference.
Engage loudness: Use at low listening levels for full frequency response.
Speaker selection: Choose A, B, or both speaker sets.
Headphone use: Plug headphones into front panel jack.

WARNING! Do not operate without proper load (speakers connected). Avoid extreme volume levels.

Maintenance

Regular maintenance ensures long-term performance.

Cleaning: Use soft, dry cloth for exterior. Control cleaning: Use contact cleaner for scratchy controls. Ventilation: Keep vents clear of dust. Storage: Cover when not in use.

CAUTION! Unplug before cleaning. Do not use liquid cleaners. Service by qualified technician only.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits. CE marked for European compliance. Copyright © Marantz; trademarks of Marantz America. For support, contact authorized Marantz service centers.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound	Speaker connections/volume	Check speaker wires; ensure volume up; verify input selection.
Hum or noise	Grounding/cables	Check phono ground; separate signal/power cables; verify connections.
One channel silent	Balance control/cables	Adjust balance; check RCA cables; test source component.
Distorted sound	Overload/damage	Reduce volume; check speaker impedance; inspect for damage.
No power	Power cord/fuse	Verify AC connection; check fuse; test outlet.

Service: Contact authorized Marantz service center for internal repairs.