Spirit FOLIO SX mixer manual

(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.
impedance balancing	a technique used on unbalanced outputs to minimise the effect of
	hum and interference when connecting to external balanced inputs.
insert	a break point in the signal path to allow the connection of external
	devices, for instance signal processors or to another mixer line level
	signals at a nominal level of -10 to +6dBu, usually coming from a
	low impedance source.
pan (pot)	abbreviation of ‘panorama’: controls levels sent to left and right out-
	puts.
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.
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.
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, negative to negative and this would correct
	polarity. If this is reversed, the result will be out-of-phase signals
	(see ‘phase’ above).
post-fade	the point in the signal path after the monitor or master fader and
	therefore affected by fader position.
pre-fade	the point in the signal path before the monitor or master fader posi-
	tion 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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