L-ACOUSTICS LA 24 MANUAL Version 2.2
17/11/08 14
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OPERATION
Operating precautions
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Make sure that the power switch is off before making any input or output connections or
operating the switches on rear panel. See pages 6-7 regarding installation.
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Make sure that the AC mains is correct and is the same as what is printed on the rear
panel of the amplifier. See page 6 regarding operating voltage and power consumption.
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Make sure that the switches on the rear panel related to operating modes, clip limiters,
and MLS™ are set in the correct position. See page 12 (operating modes), page 16 (clip
limiters) and pages 10-11 (MLS switches) for further information.
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It is always a good idea to turn down the gain controls before powering up in order to
prevent speaker damage if there is a high signal level at the input.
Powering up - Soft start
When you power up the amplifier it takes a few seconds to check its circuits (this is known as
the "soft start" or "slow start" sequence), the fans blow at high speed before going into "idle"
then the two bottom green LED’s come on to show that the output circuits are receiving the
correct rail voltage.
Input attenuators
The two input level attenuators on the front panel alter the signal level for their respective
amplifier channels in all modes. They are calibrated in dB to help in setting up active
loudspeaker systems or for cutting down unwanted noise from the input signal. In bridged
mode, both controls must be in the same position so that the speaker load will be shared
equally between the channels.
Gain
The LA 24 is configured for 32 dB gain as standard. Most professional mixing consoles operate
at a nominal level of +4dBu therefore 32 dB gain gives you plenty of fader movement.
INPUT SENSITIVITY
GAIN
Vrms
dBV
dBu
32 dB
1.88
5.5
7.7
