Allen&Heath Scepter USER GUIDE - Manual (Page 25)

Audio Owner Manual Section 3
PFL Button (Pm-Fader Llsten)
Engaging the PFL allows you to listen to the Pre-Fader signal in the monitor
and headphone outputs. The PFL system takes its signal after the EQ section but
before the channel fader. This allows you to make signal level and quality checks
before bringing up the channel in the mix. When a PFL switch is engaged, the L/R
meters will indicate the PFL level; the channel PEAK Indicator will illuminate at half
intensity; and the PFL indicator in the master section will illuminate.
Peak signal Indicator
This red LED illuminates when channel audio signals approach overload. The
peak detection circuit samples the signal after the preamp, after the equaliser and
after the fader so revealing risk of overload at all stages.
Signal present Indicator
This green LED monitors the signal at the output of the channel preamp. The
intensity will vary with the strength of the channel signal starting at and
reaching a constant intensity when the signal reaches approx The EQ, fader
and mute settings will not affect the LED.
Channel Fader
Used to alter the level of an individual channel in the mix. Normal operating
position is at the 0 mark. However, an extra boost can be obtained with the
fader fully up. Also provides the signal feed to AUX mixes selected for POST
FADER operation.
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