LG HT904PA-AMP Manual

The LG HT904PA-AMP is a home theater system amplifier featuring Dolby Digital and DTS decoding, multiple audio inputs (optical, coaxial, analog), HDMI connectivity, AM/FM tuner, USB playback, Bluetooth connectivity, multi-room audio capability, and a powerful amplifier section. It supports various speaker configurations and includes a comprehensive remote control. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Main amplifier unit, Remote Control, Speaker terminals, HDMI ports, Optical/Coaxial inputs, USB port, Bluetooth antenna, AM/FM antenna terminals.

Feature	Description
HDMI Inputs/Output	For connecting video sources and output to TV with audio return channel
Optical/Coaxial Inputs	For digital audio from TV, Blu-ray players, etc.
USB Port	For playback of audio files from USB storage devices
Bluetooth	For wireless audio streaming from smartphones and tablets
AM/FM Tuner	Built-in radio with preset memory
Speaker Terminals	For connecting front, center, surround and subwoofer speakers
POWER	Turns amplifier on/off
INPUT SELECT	Cycles through available audio sources
VOLUME	Adjusts master volume level
SOUND MODE	Selects audio processing modes (Movie, Music, Game, etc.)

Installation

Unpack and inspect contents. Place amplifier in well-ventilated location.

1. Connect speakers: Match polarity (+/-) and ensure proper impedance.
2. Connect audio sources: Use HDMI for best quality, optical/coaxial for digital audio.
3. Connect TV: Use HDMI ARC for audio from TV apps.
4. Connect antennas: Attach AM loop and FM wire antennas.
5. Plug into AC power.

WARNING! Ensure proper ventilation to prevent overheating. Keep away from heat sources.

First-Time Setup

Power on amplifier; follow on-screen display if connected via HDMI.

1. Speaker setup: Run auto calibration or manually set distances/levels.
2. Input configuration: Assign names to inputs for easy identification.
3. Network setup: Connect to WiFi for streaming services and updates.
4. Bluetooth pairing: Put in pairing mode and connect from mobile device.
5. Radio presets: Auto-scan and save favorite stations.

CAUTION! Ensure all connections are secure before powering on.

Specifications

• Amplifier Power: 100W per channel (front), 500W total system power.
• Audio Decoding: Dolby Digital, DTS, Dolby Pro Logic II.
• Connectivity: 4x HDMI (3 in, 1 out with ARC), 2x Optical, 1x Coaxial, 3x Analog, USB, Bluetooth 4.2.
• Speaker Support: 5.1 channel surround sound.
• Radio: AM/FM with 30 presets.
• Supported Formats: MP3, WMA, AAC, FLAC, WAV (via USB).
• Power Source: 120V AC, 60Hz.
• Dimensions: 17.3" W × 4.3" H × 13.8" D.

Controls and Settings

Access menu via remote or front panel buttons. Front Panel: POWER, INPUT, VOLUME, SOUND MODE, SETUP.

Remote: POWER, Numeric buttons, INPUT SELECT, VOLUME, MUTE, MENU, NAVIGATION, ENTER, SOUND MODE, SUBTITLE, AUDIO.

Audio Settings: Bass, Treble, Balance, Speaker levels/distances, Crossover frequency. Video: HDMI settings, resolution output. Network: WiFi setup, software update. System: Language (ENGLISH default), factory reset, sleep timer.

Connecting Devices

HDMI: For modern devices with audio/video. Optical/Coaxial: For digital audio from older devices. Analog: For legacy equipment.

1. Turn off amplifier and devices before connecting.
2. Use quality cables for best performance.
3. Select input via INPUT button (HDMI1, HDMI2, OPT, COAX, USB, BT).

Tip: Label cables for easy identification of connected devices.

Audio Playback Modes

Supports various audio processing modes for different content types.

1. Movie Mode: Enhances surround effects for films.
2. Music Mode: Optimizes for stereo music playback.
3. Game Mode: Improves positional audio for gaming.
4. Night Mode: Compresses dynamic range for late-night viewing.
5. Direct Mode: Bypasses processing for pure audio.
6. Multi-room: Zone 2 output for second room audio.

WARNING! Avoid excessive volume levels to prevent hearing damage.

Network & Connectivity

Bluetooth: Pair with devices for wireless streaming. USB: Play audio files from flash drives. Network: Connect to home network for firmware updates.

Care & Cleaning

Unplug before cleaning. Use soft, dry cloth for exterior. Compressed air for vents.

CAUTION! Do not use liquid cleaners. Keep vents clear for proper airflow.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. Copyright © LG Electronics Inc. Bluetooth® is a registered trademark of Bluetooth SIG, Inc. For support, visit www.lg.com or contact 1-800-243-0000.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No sound from speakers	Wrong input/volume	Select correct input; increase volume; check mute.
Bluetooth not connecting	Pairing mode/distance	Enable pairing mode; move device closer; remove obstacles.
HDMI no signal	Cable/input selection	Check cable connections; select correct HDMI input.
Overheating	Ventilation blockage	Ensure adequate ventilation; clear vents; reduce volume.
Remote not working	Batteries/obstacles	Replace batteries; point directly at IR sensor; remove obstacles.

Reset: Menu > System > Factory Reset if experiencing persistent issues.

Service: 1-800-243-0000; www.lg.com