LG LPA-735 Manual

The LG LPA-735 is a high-performance audio amplifier designed for home entertainment systems, featuring multiple input options, digital signal processing, remote control operation, and advanced audio tuning capabilities. Below are key sections covering safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Digital amplifier circuit, Remote Control, Multiple audio inputs, Speaker terminals, Display panel, Power switch.

Feature	Description
Power Output	100W per channel (8Ω)
Input Options	RCA, Optical, Coaxial, Bluetooth
Speaker Terminals	Spring-clip connectors for easy wiring
Display Panel	LED display for mode and volume
Remote Control	Full function remote included
Audio Processing	DSP with multiple sound modes
Headphone Output	3.5mm jack for private listening
Power Switch	Main power on/off control
Volume Control	Digital encoder with memory
Input Selector	Rotary switch for source selection

Installation

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

1. Connect speakers: Use speaker wire to connect to spring-clip terminals.
2. Connect audio sources: Use RCA cables for analog sources, optical/coaxial for digital.
3. Connect power: Plug into AC power outlet.
4. Connect antenna: For Bluetooth/FM radio functionality.

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

First-Time Setup

Power on amplifier; follow initial configuration.

1. Select input source: Rotate INPUT selector to desired source.
2. Adjust volume: Start at minimum volume, gradually increase.
3. Configure sound mode: Press SOUND MODE to select preset (Music, Movie, News).
4. Pair Bluetooth: Enter pairing mode, connect from your device.

CAUTION! Ensure all connections are secure before powering on.

Specifications

• Power Output: 100W x 2 (8Ω, THD 0.1%)
• Frequency Response: 20Hz - 20kHz (±1dB)
• Total Harmonic Distortion: <0.1% (1kHz, 50W)
• Signal-to-Noise Ratio: >90dB
• Input Sensitivity: 200mV (RCA), 500mV (Digital)
• Input Impedance: 47kΩ
• Supported Formats: MP3, WMA, AAC, FLAC, WAV
• Bluetooth Version: 5.0 with aptX support
• Power Consumption: 120W max, 0.5W standby
• Power Source: 120V AC, 60Hz

Controls and Settings

Front Panel: POWER, INPUT SELECTOR, VOLUME KNOB, SOUND MODE, DISPLAY.

Remote: POWER, INPUT SELECTION, VOLUME UP/DOWN, MUTE, SOUND MODE, BASS/TREBLE, PRESET MEMORY.

Sound Modes: MUSIC (flat response), MOVIE (enhanced bass), NEWS (voice clarity), USER (custom). Tone Controls: Adjustable bass and treble (±10dB). Display Settings: Brightness adjustment, input indicator. Bluetooth: Pairing mode, device list management.

Connecting Devices

Audio Sources: RCA for analog, optical/coaxial for digital. Speakers: Spring-clip terminals.

1. Turn off amplifier before making connections.
2. Connect source devices using appropriate cables.
3. Connect speakers observing correct polarity (+/-).
4. Select input source using front panel or remote.

Tip: Use high-quality cables for best audio performance.

Audio Configuration

Supports multiple audio formats and processing modes.

1. Select sound mode: Press SOUND MODE to cycle through presets.
2. Adjust tone: Use BASS/TREBLE controls to customize sound.
3. Balance control: Adjust L/R balance if needed.
4. Loudness: Engage for better low-volume listening.
5. Direct mode: Bypass all processing for pure audio.
6. Preset memory: Save custom settings to memory slots.
7. Bluetooth pairing: Hold PAIR button, select LPA-735 on device.
8. FM tuning: Auto-scan and save radio stations.

WARNING! Avoid extreme volume levels to prevent speaker damage.

Remote Control Operation

Remote control functions: All major operations available via remote.

Battery installation: Two AAA batteries required. Operating range: Up to 8 meters. Function buttons: Power, input selection, volume, mute, sound modes, numeric presets, menu navigation.

Care & Maintenance

Unplug before cleaning. Use soft, dry cloth only; avoid liquids.

CAUTION! Do not use chemical cleaners; keep away from moisture and heat sources.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits. Copyright © 2023 LG Electronics Inc. Bluetooth® is a registered trademark. For support, visit www.lg.com or contact 1-800-243-0000.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power cord/outlet	Check power connection; ensure outlet is working.
No sound	Volume/mute/connections	Check volume level; ensure mute is off; verify connections.
Distorted sound	Volume level/speakers	Reduce volume; check speaker impedance and wiring.
Bluetooth not connecting	Pairing mode/distance	Enter pairing mode; ensure device is within range.
Remote not working	Batteries/obstructions	Replace batteries; ensure line of sight to IR sensor.
Overheating	Ventilation/load	Ensure proper ventilation; check speaker load.

Reset: Hold POWER + SOUND MODE for 5 seconds to factory reset.

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