Marantz PM45 Manual

The Marantz PM45 is a high-quality stereo integrated amplifier featuring 60 watts per channel, high-current power supply, gold-plated input connectors, MM phono stage, tone controls, loudness compensation, and direct source switching. With its robust construction and audiophile-grade components, the PM45 delivers exceptional sound quality for music enthusiasts. 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 Functions 6. Connecting Components 7. Operation Guide 8. Maintenance 9. Technical Information 10. Troubleshooting

Features at a Glance

Key components: High-current power amplifier, gold-plated RCA inputs, speaker terminals, tone controls, source selector.

Feature	Description
Power Output	60 watts per channel (8 ohms, 20Hz-20kHz)
Inputs	Phono (MM), CD, Tuner, Aux, Tape 1, Tape 2
Outputs	Speaker A/B, Tape Out, Pre Out
Tone Controls	Bass and Treble adjustment
Loudness Compensation	Enhances bass at low volume
Power Supply	High-current toroidal transformer
Construction	Gold-plated connectors, aluminum front panel
Dimensions	440mm (W) x 130mm (H) x 355mm (D)
Weight	8.5 kg
Power Requirements	120V/230V, 50/60Hz

Installation

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

Connect speakers: Use high-quality speaker cable to Speaker A/B terminals.
Connect source components: Use RCA cables to appropriate inputs (Phono, CD, etc.).
Connect power cord: Plug into AC outlet after all connections are complete.
Ensure proper ventilation: Leave at least 10cm clearance around amplifier.

WARNING! Do not place near heat sources or in humid environments. Ensure proper grounding.

First-Time Setup

Power on amplifier; allow 30 seconds for stabilization.

Select source: Turn SOURCE SELECTOR to desired input (CD, Phono, etc.).
Adjust volume: Start with volume at minimum, gradually increase to desired level.
Set tone controls: Begin with flat response (12 o'clock position).
Speaker selection: Choose Speaker A, B, or A+B as needed.

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

Specifications

Power Output: 60W + 60W (8Ω, 20Hz-20kHz, 0.02% THD)
Frequency Response: 5Hz-50kHz (+0/-3dB)
Input Sensitivity: Phono: 2.5mV, Line: 150mV
Signal-to-Noise Ratio: Phono: 80dB, Line: 100dB
Total Harmonic Distortion: 0.02% (20Hz-20kHz)
Damping Factor: 100 (8Ω, 1kHz)
Tone Control Range: Bass: ±8dB (100Hz), Treble: ±8dB (10kHz)
Power Consumption: 220W maximum
Dimensions: 440 x 130 x 355 mm (W x H x D)
Weight: 8.5 kg

Controls and Functions

Front Panel: POWER switch, SOURCE SELECTOR, VOLUME, BASS, TREBLE, LOUDNESS, SPEAKER A/B, TAPE MONITOR.

Rear Panel: Input connectors (Phono, CD, Tuner, Aux, Tape), Speaker terminals, Pre Out, AC input.

Source Selection: Rotate knob to select input source. Tone Controls: Adjust bass and treble to preference. Loudness: Compensates for Fletcher-Munson curve at low volumes. Speaker Selection: Choose between Speaker A, B, or both. Tape Monitor: Allows monitoring of tape recording.

Connecting Components

Speaker Connections: Use high-quality speaker wire to A/B terminals. Source Connections: Use RCA cables to appropriate inputs.

Turn off amplifier before making connections.
Connect turntable to PHONO input (MM cartridge only).
Connect CD player to CD input.
Connect tuner to TUNER input.
Connect tape deck to TAPE 1 or TAPE 2.
Connect auxiliary sources to AUX input.

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

Operation Guide

Daily operation procedures for optimal performance.

Power sequence: Turn on source components first, then amplifier.
Source selection: Rotate SOURCE SELECTOR to desired input.
Volume adjustment: Start low, increase gradually to desired level.
Tone adjustment: Use BASS and TREBLE controls to suit room acoustics.
Loudness: Engage for listening at low volume levels.
Shutdown: Turn volume to minimum, then power off amplifier.

WARNING! Never operate without proper load (speakers connected). Avoid shorting speaker terminals.

Maintenance

Unplug before cleaning. Use soft, dry cloth for exterior. Do not use chemicals or abrasives.

CAUTION! Do not open chassis - no user-serviceable parts inside. Refer servicing to qualified personnel.

Technical Information

Circuit Design: Direct-coupled amplifier with DC servo. Power Supply: Toroidal transformer with large filter capacitors. Protection: DC offset protection, thermal protection, short-circuit protection. Construction: Copper-plated chassis, gold-plated connectors, high-quality components throughout.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound	Speaker connections/volume	Check speaker wires; ensure volume is up; verify source selection.
Distorted sound	Overload/speaker impedance	Reduce volume; check speaker impedance (minimum 4Ω).
Hum or noise	Grounding/cable routing	Check ground connections; separate signal and power cables.
One channel silent	Connection/balance	Check RCA cables; verify source output; inspect speaker connections.
Protection mode	Overload/short circuit	Turn off, check for shorted speaker wires, allow cooling.

Service: Contact authorized Marantz service center for repairs.

Support: Refer to Marantz website or contact local distributor.