Marantz PM 45 User Manual

The Marantz PM 45 is a high-quality stereo integrated amplifier featuring advanced audio circuitry, multiple input options, phono stage for turntables, tone controls, headphone output, and robust power output. Designed for audiophiles seeking exceptional sound quality with classic Marantz reliability. Below are key sections for features, installation, operation, specifications, and troubleshooting.

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

Features at a Glance

Key components: High-current power amplifier, Phono input, Multiple line inputs, Tape monitor, Tone controls, Headphone output, Speaker selector.

Feature	Description
Power Output	High-current amplification for dynamic sound
Phono Input	MM cartridge compatible for turntables
Line Inputs	Multiple inputs for CD, Tuner, Aux, Tape
Tone Controls	Bass and treble adjustment
Headphone Output	6.3mm jack for private listening
Speaker Selector	A/B speaker switching
Tape Monitor	For recording and monitoring
Loudness Control	Compensates for low volume listening
Power Switch	Main power on/off
Volume Control	Precise level adjustment

Installation

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

Connect speakers: Use high-quality speaker cable to A/B speaker terminals.
Connect audio sources: Use appropriate cables for Phono, CD, Tuner, Aux inputs.
Connect tape deck: Use Tape In/Out for recording and 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; allow warm-up for optimal performance.

Select input source: Choose Phono, CD, Tuner, or Aux as required.
Adjust volume: Start at minimum volume and increase gradually.
Set tone controls: Begin with flat response (12 o'clock position).
Test speakers: Use A/B selector to verify all speakers working.

CAUTION! Always turn volume to minimum before powering on/off to protect speakers.

Specifications

Power Output: 45 watts per channel (8 ohms)
Frequency Response: 10Hz - 50kHz (+0/-3dB)
Total Harmonic Distortion: <0.05%
Input Sensitivity: Phono: 2.5mV, Line: 150mV
Signal-to-Noise Ratio: Phono: 80dB, Line: 100dB
Tone Controls: Bass: ±10dB, Treble: ±10dB
Power Requirements: 120V/230V AC, 50/60Hz
Dimensions: Standard component width (430mm)
Weight: Approximately 8kg

Controls and Settings

Front Panel: Power switch, Input selector, Volume control, Tone controls, Loudness, Speaker selector, Headphone jack.

Rear Panel: Phono input, Line inputs (CD, Tuner, Aux), Tape In/Out, Speaker terminals, AC power input.

Input Selection: Rotate selector for Phono, CD, Tuner, Aux, Tape. Tone Controls: Bass and treble adjustment knobs. Loudness: Compensates for Fletcher-Munson curve. Speaker Selector: A/B speaker switching. Volume: Logarithmic potentiometer for smooth control.

Connecting Devices

Phono: Connect turntable with ground wire. Line Inputs: CD player, tuner, auxiliary sources. Tape: Tape deck for recording.

Turn off amplifier before making connections.
Use high-quality interconnects for best performance.
Ensure proper grounding for phono connection.
Match cable types to input requirements.

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

Operation Guide

Daily operation procedures for optimal performance.

Power on: Switch amplifier on, wait for relay click.
Select source: Choose appropriate input for your audio source.
Adjust volume: Start low and increase to desired level.
Use tone controls: Adjust bass and treble to preference.
Speaker selection: Choose A, B, or A+B for connected speakers.
Tape monitoring: Engage for recording or tape playback.
Headphone use: Plug in headphones to mute speakers automatically.

WARNING! Do not operate with cover removed. Avoid excessive volume levels.

Audio Features

Phono Stage: High-quality moving magnet phono preamp. Tone Controls: Independent bass and treble adjustment. Loudness: Frequency compensation at low volumes. Direct Source: Bypass tone controls for pure signal path.

Care & Maintenance

Unplug before cleaning. Use soft, dry cloth for exterior. Keep ventilation openings clear.

CAUTION! Do not use liquid cleaners. Avoid moisture and extreme temperatures.

Regulatory Information

CE compliant for European markets. FCC Part 15 Class B for US. Manufactured to international safety standards. Copyright © Marantz. For support, contact authorized Marantz service centers or visit www.marantz.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound from speakers	Volume/connections	Check volume level; verify speaker connections; check input selection.
Distorted sound	Overload/speakers	Reduce volume; check speaker impedance; verify source quality.
Hum or noise	Grounding/cables	Check phono ground; separate signal/power cables; verify connections.
One channel silent	Balance/cables	Check balance control; verify interconnects; test source component.
Protection mode engaged	Short circuit/overheat	Check speaker wires for shorts; allow cooling; reset power.

Reset: Power cycle amplifier if issues persist.

Service: Contact authorized Marantz service center for technical support.