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L-Acoustics LA 24 User Manual

L-Acoustics LA 24
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Version 2.2
September 1999
LA 24
OWNERS MANUAL
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L-Acoustics LA 24 Specifications

General IconGeneral
Max. Output Power2400 W
Input Impedance20 kΩ
Amplifier Gain32dB
Operating Voltage100-240V
Input ConnectorsXLR
Output ConnectorsSpeakon NL4
THD<0.1%

Summary

INTRODUCTION

UNPACKING

Instructions for carefully opening the shipping carton and checking for damage.

WARNINGS

Crucial safety precautions to follow before operating the amplifier.

USER RESPONSIBILITY

FRONT PANEL

Carry/protection handle

Describes the function of the handles for carrying and protecting the front panel.

Input level attenuators

Controls used to adjust the signal level entering the amplifier.

TEMP indicator

Indicates if the amplifier is operating above its maximum temperature.

VHF protect indicator

Lights up when high-frequency signals are present at the output terminals.

CLIP indicator

Shows when the amplifier output is clipping or limiting.

Fan grill filter

Removable grilles with foam filters to prevent dust entry.

Power switch

Used to turn the amplifier on and off.

REAR PANEL

Speaker connector

Describes the Neutrik NL4FC Speakon connectors for speaker output.

MLS™ switches

Minimum Load Select switches for matching output power to speaker load.

Clip limiter switch

Switch to turn the clip limiter circuit on or off.

Input signal TRS jack

Alternative input connector for signal or linking other amplifiers.

Input signal XLR

Standard XLR connector for signal input.

Phase reverse switch for channel B

Reverses input signal phase for channel B, used for bridged operation.

Link switch

Drives both channels simultaneously or used for bridged operation.

AC line cord

Connection for the mains power cable.

INSTALLATION

Mounting

Guidelines for rack mounting the amplifier in a standard EIA 19 inch rack.

Cooling

Explains the forced air cooling system and ventilation requirements.

Operating voltage

Information on selecting and connecting the correct AC mains voltage.

Grounding

Power consumption

Input connections

Connecting speakers

Load matching (MLS-switches)

MLS™ positions

OPERATING MODES

Stereo operation

Describes how to operate the amplifier in stereo mode.

Tandem mono

Explains the tandem mono operation mode for driving both channels with one signal.

Bridged mono

Details how to configure the amplifier for bridged mono operation.

Stereo reverse

OPERATION

Operating precautions

Lists essential precautions to follow before operating the amplifier.

Powering up - Soft start

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

Input attenuators

Explains the function of front panel input level attenuators.

Gain

Details the standard gain configuration and sensitivity.

Indicators

"-25 dB" LEDs

These LEDs act as signal present indicators.

CLIP indicator

Shows clipping or limiting conditions and how the limiter affects its behavior.

Yellow LEDs

Indicates when protection circuits are activated.

PROTECTION FEATURES

Clip limiter

Prevents speaker damage by limiting clipped signals; can be turned on/off.

Thermal protection

Protects against overheating by muting the signal and cycling cooling.

VHF protection

Mutes signal if high-frequency signals are present at the output for an extended period.

Short circuit protection

Protects against short circuits by holding output devices within their safe area.

AC mains voltage protection

Shuts down power supply if AC mains voltage is outside the allowed range.

DC protection

Protects against DC levels on the output, using fuses and crowbar circuits.

DESIGN FEATURES

Cooling

Explains the patented Intercooler™ heat sink system for efficient cooling.

Light weight

Discusses the power-to-weight ratio and contributing design elements.

Switch mode power supply (SMPS)

Details the regulated switch mode power supply and its advantages.

MLS™-switches

SAFETY APPROVALS

EMC approvals

Details Electro Magnetic Compatibility requirements for emission and immunity.

Emission

Specifies the allowed radiated emission levels and frequency range.

Immunity

Outlines the types of interference the equipment must handle.

EMC-declaration

Declares conformity with EMC directives and lists relevant standards.

APPENDIX A

Mains voltage selection

Step-by-step guide to reconfiguring the amplifier for 115V or 230V operation.

MAINTENANCE

TROUBLESHOOTING

WARRANTY AND DISCLAIMERS

General

Covers the standard warranty period and conditions for repair or replacement.

International

Advises contacting suppliers for country-specific warranty information.

TECHNICAL ASSISTANCE

International

Guides users to contact local dealers or distributors for assistance.

Factory service

Details the procedure for returning the product for factory service.

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