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L-Acoustics LA48A User Manual

L-Acoustics LA48A
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Version 1.0
January 2003
LA48a
OWNERS MANUAL

Table of Contents

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L-Acoustics LA48A Specifications

General IconGeneral
Amplifier TechnologyClass D
Number of Channels4
Power Output (8 Ohms)1200 W
Power Output (4 Ohms)2400 W
Power Output4800 W
Gain32 dB
Power Supply100-240 V AC, 50/60 Hz
Input ConnectorsXLR
Output ConnectorsSpeakon
THD+N< 0.1%
S/N Ratio> 100 dB
Input Impedance20 kΩ
Dimensions (H x W x D)88 x 483 x 360 mm
CoolingVariable speed fan
Frequency Response20Hz - 20kHz (+0/-1dB)

Summary

Warnings and Safety

Important Safety Instructions

Crucial guidelines for safe amplifier operation, including handling, connections, and environment.

User Responsibility

Speaker Damage Prevention

Advises on preventing loudspeaker damage from overpowering or misuse.

Speaker Output Hazard

Warns about hazardous output voltages and touching exposed speaker wiring.

Impedance Matching (MLS Switch)

MLS Switch Functionality

Explains power/impedance matching for various loads and MLS settings.

MLS Technology and Clip Limiter

Clip Limiter Functionality

Details how the clip limiter prevents loudspeaker damage from clipped signals.

Installation and Cooling

Operating Voltage and Grounding

Operating Voltage Requirements

Specifies AC voltage requirements and wiring for the amplifier.

Input Connections

Speaker and Unbalanced Connections

Operation Modes

Stereo Mode Operation

Describes independent channel operation and recommended impedance.

Operation Modes and Precautions

Bridged Mono Mode Setup

Details how to configure the amplifier for bridged mono operation.

Operating Precautions

Warns against terminal connection issues and emphasizes speaker polarity.

Power-Up and Indicators

Protection Features

Clip Limiter Function

Details how the clip limiter prevents loudspeaker damage from clipped signals.

Thermal and VHF Protection

Explains thermal protection and VHF signal muting.

Short Circuit Protection

Describes the amplifier's short circuit protection circuitry.

Advanced Protection and Indicators

Automatic Fuse Saver (AFS)

Explains the AFS limiter and its indication on the front panel.

AC Mains Voltage Protection

Details automatic shutdown for over/under voltage conditions.

AC and DC Protection

Describes the AC indicator LED and DC protection mechanisms.

Maintenance and Troubleshooting

Troubleshooting Common Faults

Provides checks for common issues like no output, thermal protection, or power indicators off.

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