Marantz SR-18U Manual

The Marantz SR-18U is a high-performance AV receiver featuring Dolby Digital and DTS decoding, 7-channel amplification, multiple audio/video inputs, advanced surround sound processing, AM/FM tuner, preamp outputs, and comprehensive connectivity options. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: 7-channel amplifier, Dolby Digital/DTS decoder, AM/FM tuner, multiple audio/video inputs, preamp outputs, remote control.

Feature	Description
Power Output	100W per channel (8 ohms, 20Hz-20kHz)
Audio Decoding	Dolby Digital, DTS, Dolby Pro Logic
Inputs	6 audio, 4 video, phono, tape monitor
Outputs	7-channel speaker, preamp, tape record
Tuner	AM/FM with 30 station presets
Surround Modes	Dolby Digital, DTS, Hall, Theater, Stadium
Remote Control	Full-function learning remote
Display	Fluorescent display with dimmer
Bass Management	Adjustable crossover frequencies
Setup Memory	Stores multiple configuration settings

Installation

Unpack and inspect contents. Place in well-ventilated area.

1. Connect speakers: Match polarity (+/-) for all channels.
2. Connect audio sources: Use appropriate input jacks (CD, DVD, etc.).
3. Connect video sources: Composite video or S-Video inputs.
4. Connect antenna: AM loop and FM wire antennas.
5. Plug into AC power.

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

First-Time Setup

Power on receiver; follow setup procedure.

1. Speaker configuration: Set speaker size (Large/Small) and distance.
2. Input assignment: Assign sources to appropriate inputs.
3. Tuner setup: Auto-scan and store FM/AM stations.
4. Surround mode: Select default listening mode.
5. Test tones: Use internal test generator for level matching.

CAUTION! Disconnect power before making connections. Verify all settings.

Specifications

• Power Output: 100W x 7 (8 ohms, 20Hz-20kHz)
• Frequency Response: 20Hz-20kHz (+0.5/-3dB)
• Total Harmonic Distortion: 0.05% (rated power)
• Signal-to-Noise Ratio: 100dB (line inputs)
• Input Sensitivity: 200mV (line), 2.5mV (phono)
• Digital Inputs: 2 optical, 1 coaxial
• Video Inputs: 4 composite, 2 S-Video
• Dimensions: 17-1/8" W x 6-3/4" H x 16-1/4" D
• Weight: 28.7 lbs
• Power Consumption: 550W maximum

Controls and Settings

Front Panel: POWER, INPUT SELECT, VOLUME, SURROUND MODE, TUNER PRESETS.

Remote: POWER, INPUT SELECT, VOLUME, MUTE, SURROUND MODES, NUMERIC, MENU, SETUP.

Audio: Bass, Treble, Balance, Loudness, Tone Defeat. Video: Input selection, monitor out. Tuner: Auto/manual tuning, preset memory. Surround: Mode selection, delay settings, channel levels. System: Speaker configuration, input rename, factory reset.

Connecting Devices

Audio: CD, DVD, Tape, Phono inputs. Video: Composite/S-Video inputs. Digital: Optical/coaxial inputs.

1. Turn off receiver and components before connecting.
2. Use high-quality cables for best performance.
3. Match input sources to correct jacks.
4. Connect speakers with proper gauge wire.
5. Assign digital inputs in setup menu.

Tip: Keep cable runs as short as possible to minimize interference.

Audio Setup and Calibration

Optimize sound for your listening environment.

1. Speaker distance: Set delay times for each channel.
2. Channel levels: Use test tones and SPL meter for calibration.
3. Crossover: Set appropriate frequencies for small speakers.
4. Surround parameters: Adjust effect levels and delay.
5. EQ settings: Use tone controls or parametric equalizer.
6. Input trim: Balance levels between different sources.

WARNING! Avoid extreme volume levels that could damage speakers or hearing.

Remote Control Operation

Learning remote can control multiple components.

1. Device selection: Press corresponding input button (TV, VCR, etc.).
2. Code entry: Enter manufacturer codes for component control.
3. Learning function: Teach commands from original remotes.
4. Macro programming: Create multi-command sequences.
5. Volume control: Master volume and individual input trim.

Care & Maintenance

Unplug before cleaning. Use soft, dry cloth; avoid chemicals.

CAUTION! Do not use liquid cleaners; ensure proper ventilation during operation.

Regulatory Information

FCC Part 15: Class B digital device compliant. UL listed for safety. Copyright © Marantz America, Inc. Dolby and DTS are registered trademarks. For technical support, contact Marantz customer service at 1-800-270-2747 or visit www.marantz.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power cord/outlet	Check power connection; verify outlet function.
No sound	Speaker connections/mute	Check speaker wires; ensure not muted; verify input selection.
Distorted sound	Volume/connections	Reduce volume; check source quality; verify connections.
Remote not working	Batteries/obstructions	Replace batteries; ensure clear path to sensor; check device selection.
No surround effect	Mode selection/settings	Select proper surround mode; verify speaker setup; check source format.

Reset: Hold TUNER PRESET and press POWER to factory reset.

Service: 1-800-270-2747; www.marantz.com