Lab.gruppen fP 2400Q - Manual (Page 15)

Channel A and B (or C and D) into
one Speakon. . (Quad or Bi-amp)
Bridged mono
Never connect either output terminal to ground or to some other output or input terminal.
For normal four-channel operation, connect each speaker load across the output’s positive and negative
terminals. Pay attention to speaker polarity; loudspeakers connected out of polarity degrade sound
quality and may be damaged as a consequence.
Keep the speaker cable leads as short as possible, and use a good quality stranded speaker cable. Do not
use shielded leads, such as microphone or guitar cable. Remember that the speaker cable robs the power
of the amplifiers in two ways: by increasing the load impedance, and by introducing resistive power
losses.
WARNING: To prevent from electric shock, do not operate the amplifier with any of the
conductor portion of the speaker wire exposed.
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• Make sure that the power switch is set to “off” before connecting any input or output or
operating the switches on rear panel. See pages 10 about installation.
• Make sure that the AC mains voltage is correct and the same as the one printed on the rear
panel of the amplifier. See pages 10 , about operating voltage and power consumption.
• Make sure that the switches on the rear panel for operation modes, clip-limiters, and the MLS™
switch are in the correct position. See page 7 about operation modes, page 15 about clip limiters
and 9 for the MLS switch.
• It is always a good idea to turn down the gain controls during power-up, to prevent speaker
damage in case a high signal is present at the input.
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When you power up the amplifier it takes a couple of seconds to check its circuits. This is known as the
"soft-start" or "slow-start" sequence. The fans then blow at high speed before going into "idle" and the
four bottom green LED’s illuminate to show the amplifier is operational.
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The four input level attenuators on the front panel adjust the signal level for their respective amplifier
channel in all modes. They are calibrated in dB to help setting up active loudspeaker systems or 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.
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