Harman 1210KA Peaking, Band, Peak LED, Distort the signal, Channel independently of the main mix

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.

Soundcraft EFX/EPM User Guide Issue 1210 43