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L-Acoustics LA24a User Manual

L-Acoustics LA24a
23 pages
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Version 1.0
January 2003
LA24a
OWNERS MANUAL

Table of Contents

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L-Acoustics LA24a Specifications

General IconGeneral
Power Output (1 channel, 8 Ohms)2400 W
Frequency Response20 Hz - 20 kHz
Total Harmonic Distortion< 0.1%
Input Sensitivity1.4 V
Dimensions (W x H x D)483 x 88 x 350 mm
Input impedance20 kOhm
Signal to noise ratio> 100 dB
THD+N< 0.1%
Power supplyUniversal switch-mode
Operating voltage100 V - 240 V
CoolingVariable speed fan

Summary

1. Approvals

2. Warnings

2.1 Explanation of Graphical Symbols

Explains warning symbols like lightning and exclamation points.

2.2 Warning

Warning to reduce fire or electric shock risk by avoiding moisture.

2.3 Caution

Caution to reduce fire or electric shock by not removing screws.

2.4 Important Safety Instructions

Key safety guidelines for operating the amplifier.

2.5 User Responsibility

Details user responsibilities and potential hazards.

2.5.1 Speaker Damage

Warning about amplifier power and potential loudspeaker damage.

2.5.2 Speaker Output Hazard

Warning about hazardous output voltages and avoiding electrical shock.

2.5.3 Radio Interference

Information on EMC compliance and potential radio interference.

3. Introduction

3.1 Unpacking

Instructions for carefully unpacking the amplifier and checking for damage.

3.2 Front Panel

Identifies and describes the controls and indicators on the front panel.

3.3 Rear Panel

Identifies and describes the connectors and switches on the rear panel.

Rear Panel Components

1. Output Speaker Connector

Details the Neutrik Speakon connector for speaker output.

2. Minimum Load Selector (MLS™) Switch

Explains the MLS switch for selecting output power and load matching.

3. Clip Limiter Switch

Describes the switch to enable or disable the clip limiter function.

4. Input Signal Connector

Details the Neutrik Combojack for input signals (XLR and 1/4" TRS).

5. Link Output

Describes the XLR male connector for linking channels to other inputs.

6. AC Power Cable

Refers to the AC power cable connection.

4. Rear Panel Features

4.1 Impedance Matching (MLS Switch)

Explains how MLS switches match impedance for optimal power delivery.

4.1.1 MLS Technology Background

Provides background information on MLS technology and its benefits.

4.2 Clip Limiter

Explains how the clip limiter prevents distortion and protects speakers.

5. Installation

5.1 Mounting

Instructions for mounting the amplifier in a 19" rack or for portable use.

5.2 Cooling

Details the forced air cooling system and airflow requirements.

5.3 Operating Voltage

Important information regarding the amplifier's operating voltage.

5.3.1 Denmark

Specific voltage and fuse requirements for Denmark.

5.3.2 Switzerland

Specific connector requirement for Switzerland.

5.4 Grounding

Explains the automatic grounding system and signal ground considerations.

5.5 Power Consumption

5.6 Heat Power Calculation

Provides a method to calculate heat power output.

5.7 Gain and Sensitivity

Explains gain settings and input sensitivity for different configurations.

6. Connections

6.1 Input Connections

Instructions for connecting audio input signals to the amplifier.

6.1.1 Balanced Inputs

Details how to connect balanced audio sources using XLR or TRS connectors.

6.1.2 Unbalanced Inputs

Instructions for connecting unbalanced audio sources.

6.2 Connecting Speakers

Instructions for connecting loudspeakers to the amplifier output.

7. Operation

7.1 Operation Modes

Describes the different operational modes of the amplifier.

7.1.1 Stereo Mode

Describes operating the amplifier in stereo mode with independent channels.

7.1.2 Tandem Mode

Explains how to link channels for tandem mode operation.

7.1.3 Bridged Mono Mode

Details how to connect speakers in bridged mono mode for higher output.

7.1.4 Bridged Mono Mode Features

Explains the benefits and power characteristics of bridged mono mode.

7.2 Operating Precautions

General precautions for safe operation and avoiding damage.

7.3 Powering Up – Soft Start

Describes the amplifier's soft start sequence upon power-up.

7.4 Input Attenuators

Explains the function of front panel input level attenuators.

7.5 Indicators

Explains the front panel indicators and their meanings.

8. Protection Features

8.1 Clip Limiter

Detailed explanation of the clip limiter function and its operation.

8.2 Thermal Protection

Explains the thermal protection mechanism and how it activates.

8.3 VHF Protection

Details the VHF protection that mutes signal for high frequency signals.

8.4 Short Circuit Protection

Describes the short circuit protection for output devices.

8.5 AC Mains Voltage Protection

Explains how the amplifier protects against over/under voltage conditions.

8.6 DC Protection

Describes the DC protection mechanisms for output signals.

9. Maintenance

9.1 Troubleshooting

Provides common troubleshooting steps for various amplifier faults.

10. Warranty

11. Technical Assistance and Service

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