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Soundcraft EFX/EPM User Guide Issue 1210
Peaking The point at which a signal rises to its maximum instantaneous level, before falling
back down again. It can also describe an equaliser response curve affecting only
a band of frequencies, (like on a graphic equaliser), “peaking” at the centre of that
band.
Peak LED A visual indication of the signal peaking just before the onset of clipping, which will
distort the signal.
PFL Pre-fade listen: a function that allows the operator to monitor the pre-fade signal in
a channel independently of the main mix.
Phase A term used to describe the relationship of two audio signals. In-phase signals
reinforce each other, out-of-phase signals result in cancellation. Phase is a meas-
urement of relative displacement between two waves of identical frequency.
Polarity A term used to describe the orientation of the positive and negative poles of an
audio connection. Normally connections are made with positive to positive, nega-
tive to
negative. If this is reversed, the result will be out-of-phase signals (see ‘phase’
above).
Post-fade The point in the signal path after a fader and therefore affected by the fader
position.
Pre-fade The point in the signal path before a fader, and therefore unaffected by the fader
position.
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.
Transient A momentary rise in the signal level.
Unbalanced A method of audio connection which uses a single wire and the cable screen as the
signal return. This method does not provide the noise immunity of a balanced input
(see above).
+48V The phantom power supply, available at the channel mic inputs, for condenser
microphones and active DI boxes.
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