LG HT904SA-AMP Manual

The LG HT904SA-AMP is a high-performance home theater audio/video receiver and amplifier system designed for immersive surround sound experiences. It features multi-channel amplification, support for various audio formats (including Dolby Digital and DTS), multiple audio/video inputs (HDMI, optical, coaxial, analog), built-in FM/AM tuner, USB playback, Bluetooth connectivity, on-screen display, remote control, and customizable sound modes. 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, Antenna connectors, Input/Output ports, Front panel controls.

Feature	Description
HDMI Inputs/Output	For high-definition video and audio connection
Optical/Coaxial Digital Inputs	For digital audio from TVs, game consoles, etc.
Analog Audio Inputs	RCA jacks for connecting legacy devices
USB Port	For playback of audio files from USB storage
Bluetooth	For wireless audio streaming from compatible devices
FM/AM Tuner	Built-in radio with preset memory
Speaker Terminals	For connecting front, center, surround, and subwoofer speakers
POWER	Turns the amplifier on/off
VOLUME	Adjusts master volume level
INPUT SELECT	Cycles through available audio sources

Installation

Unpack and inspect all components. Place the main unit on a stable, well-ventilated surface.

1. Connect Speakers: Match speaker wires to correct terminals (Front L/R, Center, Surround L/R, Subwoofer). Observe polarity (+/-).
2. Connect Audio Sources: Use HDMI, optical, coaxial, or analog cables to connect your TV, Blu-ray player, game console, etc., to the corresponding inputs on the amplifier.
3. Connect Antennas: Attach the supplied FM wire antenna and AM loop antenna to their respective terminals.
4. Connect to Power: Plug the supplied power cord into the AC inlet on the rear and then into a wall outlet.

WARNING! Ensure the unit is disconnected from power during connection. Do not block ventilation slots.

First-Time Setup

Power on the amplifier; the display will illuminate.

1. Initial Source Setup: Press INPUT SELECT to choose the source you wish to configure first (e.g., HDMI1).
2. Speaker Configuration: Access the SETUP menu via remote to set speaker size (Large/Small), distance, and channel levels. Run the auto-calibration if supported.
3. Sound Mode Selection: Use the SOUND MODE button to select a preset (Movie, Music, Game, Standard) or customize your own.
4. Tuner Setup: For radio, enter TUNER mode and use AUTO PRESET to scan and save available stations.

CAUTION! Do not connect speakers while the unit is powered on to avoid damage or shock.

Specifications

• Amplifier Power: 100W per channel (front, at 6 ohms, 1kHz, THD 10%).
• Audio Formats: Dolby Digital, DTS, PCM.
• Connectivity: HDMI (v1.4 with ARC), Optical In x2, Coaxial In, Analog Audio In, USB, Bluetooth.
• Tuner: FM/AM with 30 station presets.
• Sound Modes: Movie, Music, Game, Night, Standard.
• Supported Media: USB playback for MP3, WMA, AAC audio files.
• Power Supply: 120V AC, 60Hz.
• Dimensions (W x H x D): Approx. 430mm x 150mm x 320mm.

Controls and Settings

Access the main menu via the SETUP button on the remote. Front Panel: POWER, INPUT SELECT, VOLUME knob, SOUND MODE, TUNER PRESET buttons.

Remote: POWER, Numeric buttons, INPUT SELECT (HDMI1, HDMI2, OPT, COAX, AUX, USB, BT), VOLUME, MUTE, SETUP, SOUND MODE, PLAY/PAUSE, SKIP.

Setup Menu: Speaker Config (Size, Distance, Level), Audio (Digital Input Assign, Delay), Video (HDMI Setup), Tuner (Auto Preset), System (Language, Reset). Sound Modes: Adjust EQ and surround effects for different content types.

Connecting Devices

HDMI: For best quality, connect source devices (Blu-ray, streaming box) to HDMI IN ports, and connect HDMI OUT to your TV. Optical/Coaxial: For TVs or devices without HDMI ARC. Analog: For older CD players, tape decks.

1. Turn off the amplifier and all devices before making connections.
2. Use high-quality cables suitable for the signal type (e.g., high-speed HDMI).
3. Assign the input in the SETUP menu if necessary (e.g., assign "GAME" to Optical 1).

Tip: For ARC (Audio Return Channel) to work, enable HDMI-CEC and ARC in both the TV and amplifier settings.

Playing Media

Supports playback from connected sources and USB storage.

1. USB Playback: Insert USB drive into front/rear port. Select USB as input. Use remote to navigate folders and play files.
2. Bluetooth Streaming: Select BT as input. Put your Bluetooth device (phone/tablet) in pairing mode. The amplifier should appear as "LG HT904SA". Select to connect and stream audio.
3. Radio: Select TUNER input. Use TUNE or PRESET buttons to select a station. Press and hold a number button to save a preset.
4. Connected Devices: Select the corresponding input (HDMI1, OPT, etc.) for the device you wish to use.

WARNING! Safely eject USB storage using the on-screen option before physical removal to prevent data corruption.

Network & Connectivity

Bluetooth: For wireless audio streaming. Ensure the amplifier is in BT mode and discoverable. USB: For direct playback of audio files. Firmware updates may also be performed via USB (check LG website).

Care & Cleaning

Disconnect from power before cleaning. Use a soft, dry cloth to wipe the exterior. For stubborn marks, lightly dampen the cloth with water. Do not use solvents or abrasive cleaners.

CAUTION! Never allow liquid to enter the unit through vents or ports. Keep away from excessive heat, humidity, and dust.

Regulatory Information

FCC Part 15: Class B digital device. Complies with limits for a Class B digital device. Copyright © LG Electronics Inc. Bluetooth® is a registered trademark of Bluetooth SIG, Inc. Dolby and DTS are trademarks of their respective owners. For support, visit www.lg.com or contact LG Customer Service at 1-800-243-0000.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power cord/outlet	Ensure power cord is securely connected to unit and wall outlet. Check outlet function.
No sound from speakers	Input/Volume/Mute	Verify correct input is selected. Check volume level and ensure MUTE is off. Confirm speaker wires are connected securely.
Bluetooth not connecting	Distance/Pairing mode	Move device closer (within 33 ft). Ensure amplifier is in BT mode and device is in pairing mode. Delete old pairing and retry.
HDMI no signal	Cable/Input/Device power	Try a different HDMI cable. Ensure TV and source device are on and set to correct output. Check HDMI input assignment in amplifier menu.
Poor radio reception	Antenna placement	Fully extend FM wire antenna. Reposition AM loop antenna. Keep away from large metal objects and other electronics.

Reset: SETUP Menu > System > Factory Reset to restore all default settings.

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