Marantz SR 225 Manual

The Marantz SR 225 is a high-performance stereo receiver featuring 50 watts per channel, AM/FM tuner, multiple audio inputs, phono input for turntables, tone controls, headphone jack, and remote control. Designed for audiophile-quality sound reproduction with Marantz's signature audio engineering. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Stereo amplifier, AM/FM tuner, Remote Control, Multiple audio inputs, Phono input, Headphone jack, Speaker terminals.

Feature	Description
Power Output	50 watts per channel (8 ohms)
AM/FM Tuner	30 station presets
Phono Input	For turntable connection
Audio Inputs	CD, Tape, Aux, Video
Headphone Jack	For private listening
Speaker Terminals	A/B speaker selection
Tone Controls	Bass and treble adjustment
Loudness Control	Enhances low-volume listening
Remote Control	Full function remote included
Power Supply	120V AC, 60Hz

Installation

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

1. Connect speakers: Use speaker wire to connect left and right speakers to terminals.
2. Connect antenna: Attach AM loop antenna and FM wire antenna.
3. Connect audio sources: Use appropriate inputs for CD player, turntable, tape deck, etc.
4. Plug into AC power outlet.

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

First-Time Setup

Power on receiver; initialize system settings.

1. Set speaker configuration: Select A, B, or A+B speakers.
2. Tune radio stations: Use auto-scan to preset AM/FM stations.
3. Adjust tone controls: Set bass and treble to preference.
4. Test all inputs: Verify each source input is working properly.

CAUTION! Keep away from heat sources and moisture. Ensure stable power supply.

Specifications

• Power Output: 50W + 50W (8 ohms, 20Hz-20kHz)
• Total Harmonic Distortion: 0.08%
• Frequency Response: 10Hz-50kHz
• Input Sensitivity: Phono: 2.5mV, Line: 200mV
• Signal-to-Noise Ratio: Phono: 80dB, Line: 100dB
• Tuner Section: AM/FM with 30 presets
• Inputs: Phono, CD, Tape, Aux, Video
• Outputs: Tape out, Headphone, Speakers A/B
• Power Consumption: 180W
• Dimensions: 17.1" W × 5.1" H × 13.8" D

Controls and Settings

Front Panel: POWER, VOLUME, INPUT SELECTOR, BASS, TREBLE, BALANCE, LOUDNESS, SPEAKERS A/B.

Remote: POWER, VOLUME, MUTE, INPUT SELECTION, TUNER PRESETS, TONE CONTROLS.

Audio Controls: Bass (±10dB), Treble (±10dB), Balance (L/R), Loudness (On/Off). Speaker Selection: A, B, A+B. Tuner: Manual tuning, Auto-scan, Preset memory. Input Selection: Phono, CD, Tape, Aux, Video.

Connecting Devices

Phono: For turntables (MM cartridge). CD: For CD players. Tape: For tape decks. Aux/Video: For additional sources.

1. Turn off receiver before connecting devices.
2. Use quality RCA cables for audio connections.
3. Connect turntable ground wire to ground terminal.
4. Select appropriate input source on front panel.

Tip: Use shielded cables for phono input to reduce noise interference.

Tuner Operation

AM/FM tuner with 30 station presets.

1. Select Tuner input on front panel.
2. Choose AM or FM band.
3. Manual tuning: Use TUNE buttons.
4. Auto-scan: Press and hold TUNE to scan for stations.
5. Store presets: Tune to station, press MEMORY, select preset number.
6. Recall presets: Use numeric buttons or PRESET buttons.

WARNING! Ensure proper antenna connection for best reception. Position antennas away from interference sources.

Audio Settings

Tone controls and audio enhancements for optimal listening.

• Bass Control: Adjust low frequencies (±10dB)
• Treble Control: Adjust high frequencies (±10dB)
• Balance: Adjust left/right channel balance
• Loudness: Compensates for Fletcher-Munson curve at low volumes
• Speaker Selection: Choose A, B, or both speaker sets

Care & Maintenance

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

CAUTION! Do not use chemical cleaners. Avoid liquid contact. Service by qualified personnel only.

Regulatory Information

FCC Part 15: Class B digital device compliant. Manufactured under license from Marantz. Copyright © Marantz. For technical support, contact authorized Marantz service centers or visit www.marantz.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power cord/outlet	Check power connection; try different outlet; check fuse.
No sound	Speaker connections/volume	Verify speaker wires; check volume level; ensure correct input selected.
Distorted sound	Source/connections	Check source device; verify cables; adjust tone controls.
Poor radio reception	Antenna/placement	Reposition antennas; ensure proper connection; check for interference.
Remote not working	Batteries/obstructions	Replace batteries; ensure line of sight to IR sensor; check range.

Reset: Unplug unit for 5 minutes to reset microprocessor.

Service: Contact authorized Marantz service center for repairs.