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feedback the ‘howling’ sound caused by bringing a microphone
too close to a loudspeaker driven from its amplified signal.
foldback a feed sent back to the artistes via loudspeakers or
headphones to enable them to monitor the sounds they are
producing.
frequency response the variation in gain of a device with frequency.
(sub) group an output into which a group of signals can be mixed.
headroom the available signal range above the nominal level
before clipping occurs.
highpass filter a filter that rejects low frequencies.
line level signals at a nominal level of -10 to +6dBu, usually coming from a low
impedance source.
mono output a mono sum of the left/ right mix outputs, providing a
separately controlled line level feed for additional
loudspeakers.
pan (pot) abbreviation of ’panorama’: controls levels sent to left
and right outputs.
peaking an equaliser response curve affecting only a band of
frequencies i.e. based on a bandpass response.
PFL (pre-fade listen) a function that allows the operator to monitor the pre-fade
signal in a channel independently of the main mix.
rolloff a fall in gain at the extremes of the frequency response.
shelving an equaliser response affecting all frequencies above or
below the break frequency i.e. a highpass or lowpass derived
response.
spill acoustic interference from other sources.
talkback the operator speaking to the artistes or to tape via the
auxiliary or group outputs.
transient a momentary rise in the signal level.
+48V the phantom power supply, available at the channel mic
inputs, for condenser microphones and active DI boxes.
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