LG HT904TA-AMP manual

The LG HT904TA-AMP is a high-performance home theater amplifier system designed to deliver immersive audio experiences. It features multi-channel audio decoding, multiple input options, wireless connectivity, and user-friendly controls. Below are key sections covering safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Main amplifier unit, remote control, speaker terminals, multiple audio/video inputs, network ports, and wireless modules.

Feature	Description
Audio Decoding	Dolby Digital, DTS, AAC support
Output Power	100W per channel (5.1 channels)
Inputs	HDMI, Optical, Coaxial, RCA, USB
Wireless	Bluetooth, Wi-Fi for streaming
Speaker Terminals	Spring-clip connectors for all channels
Display	Front panel LED display
Remote Control	Full function remote with backlight
Network Features	DLNA support, firmware updates
Sound Modes	Movie, Music, Game, Direct
Auto Calibration	Built-in microphone for speaker setup

Installation

Unpack and inspect all components. Place amplifier on well-ventilated surface.

1. Connect speakers: Match speaker wires to correct terminals (Front L/R, Center, Surround L/R, Subwoofer).
2. Connect audio sources: Use HDMI, optical, or RCA cables from TV, Blu-ray, game console, etc.
3. Connect to TV: Use HDMI ARC or optical cable for audio return.
4. Connect power cord to AC outlet.

WARNING! Ensure proper ventilation around amplifier. Do not block vents to prevent overheating.

First-Time Setup

Power on amplifier; follow on-screen setup if connected via HDMI to TV.

1. Auto speaker calibration: Connect calibration microphone, run auto setup from menu.
2. Set input assignments: Assign names to inputs (BD, TV, GAME, etc.).
3. Configure network: Connect Ethernet or set up Wi-Fi for streaming services.
4. Adjust audio settings: Set speaker sizes, distances, and levels manually if needed.

CAUTION! Ensure all connections are secure before powering on.

Specifications

• Amplifier Type: 5.1 Channel Digital Amplifier
• Total Power Output: 500W RMS
• Frequency Response: 20Hz - 20kHz
• Signal-to-Noise Ratio: >95dB
• Input Sensitivity: 200mV
• Supported Formats: Dolby Digital, DTS, AAC, MP3, WMA, FLAC
• Connectivity: HDMI (4 in, 1 out), Optical (2), Coaxial (1), USB (1)
• Wireless: Bluetooth 4.2, Wi-Fi 802.11n
• Power Requirements: 120V AC, 60Hz, 250W
• Dimensions: 430mm x 320mm x 150mm (W x D x H)

Controls and Settings

Front Panel: POWER, INPUT SELECT, VOLUME, SOUND MODE, SETUP button.

Remote: POWER, Numeric buttons, INPUT SELECT, VOLUME, MUTE, SOUND MODE, SETUP, NAVIGATION buttons.

Audio Settings: Speaker configuration (size, distance, level), Crossover settings (80Hz-200Hz), Equalizer presets. Input Setup: Rename inputs, assign audio formats. Network: Wi-Fi setup, firmware update, streaming service login. System: Language (ENGLISH default), factory reset, standby mode.

Connecting Devices

HDMI: Connect up to 4 devices to HDMI inputs; HDMI OUT to TV. Optical/Coaxial: For digital audio from TV or media players. Analog: RCA cables for older devices.

1. Turn off amplifier and devices before connecting.
2. Use high-quality cables for best performance.
3. Select input via INPUT button or remote (HDMI1, HDMI2, OPT, etc.).

Tip: Enable HDMI CEC in settings for single remote control of connected devices.

Audio Modes & Effects

Multiple sound modes for different content types.

1. Movie Mode: Enhances surround effects for films.
2. Music Mode: Optimizes for stereo and multi-channel music.
3. Game Mode: Improves positional audio for gaming.
4. Direct Mode: Bypasses processing for pure audio.
5. Night Mode: Compresses dynamic range for late-night viewing.
6. Dialog Enhancement: Boosts center channel for clearer speech.
7. Virtual Surround: Creates surround effect with fewer speakers.

Note: Adjust mode based on content for optimal experience.

Network & Wireless Features

Stream audio from various sources.

1. Bluetooth: Pair with smartphones/tablets for wireless audio.
2. Wi-Fi: Connect to home network for streaming services (Spotify, Pandora).
3. DLNA: Stream music from network-attached storage or PCs.
4. Firmware Updates: Check for and install updates via network.
5. Mobile App: Control amplifier using LG Music Flow app.

Tip: For stable streaming, use wired Ethernet connection when possible.

Care & Cleaning

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

CAUTION! Do not use liquid cleaners. Avoid moisture near ventilation openings.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. Copyright © 2023 LG Electronics; all trademarks property 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	Check power connection; try different outlet; ensure power switch is on.
No sound	Input selection, volume	Select correct input; check volume level; ensure mute is off.
Poor sound quality	Speaker connections, settings	Check speaker wire connections; rerun auto calibration; adjust EQ settings.
Bluetooth not connecting	Pairing mode, distance	Enter pairing mode on amplifier; ensure device is within range; remove obstacles.
Network issues	Wi-Fi signal, credentials	Check Wi-Fi signal strength; re-enter network password; restart router.
Overheating	Ventilation, placement	Ensure adequate ventilation; move to cooler location; clean dust from vents.

Reset: Hold SETUP button for 10 seconds to factory reset.

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