AudioControl LC-4.800 User Manual

1. Introduction

Welcome to the user manual for the AudioControl LC-4.800 Multi-Channel 800 Watt RMS High Power Car Audio Amplifier. This amplifier is designed to provide exceptional audio performance and control for your car audio system, whether integrating with an aftermarket or factory stereo.

The LC-4.800 delivers 125 watts RMS per channel and can be bridged to provide 400 watts per channel, ensuring powerful and clear sound reproduction. It features advanced technologies like AccuBASS for enhanced low-frequency response and MILC (Maximum Input Level Control) for optimal signal integrity.

2. Key Features

Power Output: 125 watts RMS x 4 channels at 4 ohms, 200 watts RMS x 4 channels at 2 ohms, 400 watts RMS x 2 channels bridged at 4 ohms.
AccuBASS Circuitry: Provides improved bass response, especially when integrating with factory audio systems that reduce bass at higher volumes.
MILC (Maximum Input Level Control): LED indicators for optimal signal flow and clip detection, preventing distortion.
GTO™ Signal Sense: Automatic turn-on when a signal is detected from speaker-level inputs.
Flexible Inputs: Six active speaker-level inputs and line-level RCA inputs for versatile connectivity.
Adjustable Crossovers: Highly adjustable high-pass and low-pass filters for precise sound tuning.
Channel Summing: Accommodates separate bass, midrange, and treble signals from complex factory systems.
Optional Remote: Compatible with the ACR-1 wired remote for volume control.

3. Product Overview

Top view of the AudioControl LC-4.800 amplifier, showing controls and input/output labels. — **Figure 3.1:** Top view of the LC-4.800 amplifier, highlighting the control panel with input/output labels, gain adjustments, and crossover settings. This view shows the overall layout and heat sink fins.

Angled rear view of the AudioControl LC-4.800 amplifier, showing power terminals, RCA inputs, and speaker outputs. — **Figure 3.2:** Angled rear view of the LC-4.800 amplifier, displaying the power input terminals, remote turn-on, ground connections, RCA line-level inputs, speaker-level inputs, and speaker output terminals. Fuses are also visible.

Side view of the AudioControl LC-4.800 amplifier, showing the heat sink design. — **Figure 3.3:** Side view of the LC-4.800 amplifier, emphasizing the robust heat sink design for efficient thermal management.

Rear panel view of the AudioControl LC-4.800 amplifier, detailing all connection ports. — **Figure 3.4:** Detailed rear panel view of the LC-4.800 amplifier, showing all connection ports including fuses, power/remote/ground terminals, line-level inputs, line outputs, speaker-level inputs, remote level control port, and speaker outputs.

Note: No official product videos were available for embedding based on the provided data.

4. Setup and Installation

4.1 Safety Precautions

Disconnect the vehicle's battery before beginning any installation.
Ensure proper grounding to prevent electrical issues.
Use appropriate gauge wiring for power, ground, and speaker connections.
Mount the amplifier securely in a well-ventilated area, away from heat sources and moisture.

4.2 Wiring Connections

The LC-4.800 offers flexible input options for both line-level (RCA) and speaker-level signals. Refer to Figure 3.4 for a visual guide to the connection panel.

Power Connection: Connect the +12V terminal to the vehicle's positive battery terminal via an appropriate fuse (not supplied).
Ground Connection: Connect the Ground terminal to a clean, bare metal chassis point in the vehicle.
Remote Turn-On: Connect the Remote terminal to the head unit's remote output or use the GTO™ Signal Sense feature.
Input Signals:
- Line-Level Inputs (RCA): Connect your head unit's RCA outputs to the Front/Left and Rear/Right RCA inputs on the amplifier.
- Speaker-Level Inputs: For factory stereos, connect the vehicle's speaker wires directly to the Speaker Level Inputs. The amplifier can sum signals if needed.
Speaker Outputs: Connect your speakers to the Speaker Outputs, observing correct polarity. The amplifier supports 4-channel stereo or 2-channel bridged configurations.
Optional ACR-1 Remote: If using, connect the ACR-1 remote to the dedicated Remote Level Control port.

Note: For optimal performance and to prevent distortion, it is recommended to use wire ferrules on speaker terminals for a cleaner and more secure connection.

5. Operating the Amplifier

5.1 Initial Power-Up and Gain Setting

After all connections are made, reconnect the vehicle's battery. The amplifier should power on. The MILC™ (Maximum Input Level Control) LEDs are crucial for setting proper gain levels.

Turn your head unit volume up to about 75% of its maximum.
Slowly increase the gain controls on the LC-4.800 for each channel until the corresponding MILC™ LED just begins to flicker or illuminate.
Once the LED flickers, back off the gain slightly until the LED is off. This indicates the maximum clean input signal level, preventing clipping and distortion.

Important: Setting gains correctly is vital for sound quality and amplifier longevity. The MILC™ LEDs provide an accurate visual indicator of clipping.

5.2 Crossover Adjustments

The LC-4.800 features adjustable crossover networks to optimize sound for your specific speakers.

High-Pass Filter (HPF): Used for full-range speakers to prevent low frequencies from reaching them, improving clarity and power handling. Adjust the frequency knob to the desired cutoff.
Low-Pass Filter (LPF): Used for subwoofers to allow only low frequencies to pass through. Adjust the frequency knob to the desired cutoff.
Band-Pass Filter (BPF): Allows a specific range of frequencies to pass through, useful for certain mid-range speaker setups.

Experiment with these settings to achieve the best sound balance for your system. Consult your speaker specifications for recommended crossover points.

5.3 AccuBASS™ Control

The AccuBASS™ circuit compensates for factory stereo bass roll-off. Adjust the AccuBASS™ threshold and level controls to restore and enhance bass response without distortion.

6. Maintenance

The AudioControl LC-4.800 is designed for reliable operation with minimal maintenance. Follow these guidelines to ensure its longevity:

Cleaning: Periodically clean the amplifier's exterior with a soft, dry cloth. Avoid using harsh chemicals or abrasive cleaners.
Ventilation: Ensure the amplifier's heat sinks are free from obstructions to allow for proper airflow and cooling. Do not cover the amplifier.
Connections: Occasionally check all wiring connections (power, ground, remote, inputs, outputs) to ensure they remain secure and free from corrosion. Loose connections can lead to performance issues or damage.
Fuses: The amplifier uses external fuses (40A x 2). If a fuse blows, replace it only with a fuse of the same type and rating. Never use a higher-rated fuse.

7. Troubleshooting

If you experience issues with your LC-4.800 amplifier, refer to the following common problems and solutions:

Problem	Possible Cause	Solution
No Power / Amplifier Not Turning On	Blown fuse Loose power or ground connection No remote turn-on signal GTO™ Signal Sense not detecting signal	Check and replace fuses (40A). Verify all power, ground, and remote wire connections are secure. Ensure head unit remote output is active, or check speaker-level input signal.
No Sound Output	Input signal issue Speaker wires disconnected or shorted Gain set too low Crossover settings incorrect	Check RCA or speaker-level input connections from head unit. Inspect speaker wiring for shorts or disconnections. Increase gain settings (refer to MILC™ LEDs). Verify crossover settings are appropriate for your speakers.
Distorted Sound	Gain set too high (clipping) Poor ground connection Speaker impedance mismatch Damaged speakers	Reduce gain until MILC™ LED is off. Ensure ground connection is clean and secure. Verify speaker impedance is within amplifier's supported range (2-ohm stereo, 4-ohm bridged). Test speakers with another amplifier if possible.
Amplifier Overheating	Insufficient ventilation Speaker impedance too low Sustained high volume levels	Ensure adequate airflow around the amplifier. Check speaker impedance. Reduce volume or consider a higher power amplifier if consistently running at maximum.

8. Specifications

Feature	Specification
Model	LC-4.800
RMS Power (4 Ohms)	125 watts x 4 channels
RMS Power (2 Ohms)	200 watts x 4 channels
RMS Power (Bridged 4 Ohms)	400 watts x 2 channels
Frequency Response	10Hz - 22kHz
Signal-to-Noise Ratio	>100 dB
THD+N	0.01%
Input Sensitivity (Line)	0.5V - 8V
Input Sensitivity (Speaker)	2V - 40V
Crossover Type	Linkwitz-Riley, 24 dB/octave
Dimensions (L x W x H)	14 x 11.5 x 3.5 inches
Weight	6 pounds

Note: Specifications are subject to change without notice for product improvement.

9. Warranty and Support

9.1 Warranty Information

AudioControl products are known for their quality and reliability. The LC-4.800 amplifier typically comes with a 5-year warranty when registered online. This warranty covers defects in materials and workmanship under normal use. Please retain your proof of purchase for warranty claims.

For detailed warranty terms and conditions, please refer to the official AudioControl website or the warranty card included with your product.

9.2 Customer Support

If you require technical assistance, have questions about installation, or need to initiate a warranty claim, please contact AudioControl customer support:

Website: Visit the official AudioControl website for FAQs, support documents, and contact information.
Phone: Refer to the contact section on the AudioControl website for phone support hours.
Email: Use the contact form or email address provided on the official website.

When contacting support, please have your product model (LC-4.800) and serial number ready.

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