Lab.gruppen iP 1150Q - Manual (Page 13)

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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 8 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 8 , about operating voltage and power consumption.
• Make sure that the switches on the rear panel for operation modes and clip-limiter switch are in
the correct position. See page 6 about operation modes and page 13 about clip limiters.
• 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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The yellow LEDs at the top indicate if
any protection circuits are activated.
These are described on page
13 .
The Clip/limit indicator tells when the
amplifier output is clipping or limiting. It
has two different indication statuses:
• If the clip limiter is engaged it has a
short time constant and it illuminates
briefly.
• If the clip limiter is not engaged it
has an increased time constant and it
illuminates for a longer period.
Front Indicators
The ”-40 dB” LED’s illuminate if the output signal is greater than -40dB (with 0dB as reference to full
output power). These LED’s also act as signal present indicators.
The four bottom green ”ON” LED’s indicate that the output circuits are receiving the correct rail
voltage.
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