feedback
the ‘how ling’ sou nd cau sed by bringing a m icrop hone
too close to a lou d sp eaker d riven from its am p lified signal.
foldback
a feed sent back to the artistes via lou d sp eakers or
head p hones to enable them to m onitor the sou nd s they are
p rod u cing.
frequency response
the variation in gain of a d evice w ith frequ ency.
(sub) group
an ou tp u t into w hich a grou p of signals can be m ixed .
headroom
the available signal range above the nom inal level
before clip p ing occu rs.
highpass filter
a filter that rejects low frequ encies.
line level signals
at a nom inal level of -10 to +6d Bu , u su ally com ing from a low
im p ed ance sou rce.
mono output
a m ono su m of the left/ right m ix ou tp u ts, p rovid ing a
sep arately controlled line level feed for ad d itional
lou d sp eakers.
pan (pot)
abbreviation of ’p anoram a’: controls levels sent to left
and right ou tp u ts.
peaking
an equ aliser resp onse cu rve affecting only a band of
frequ encies i.e. based on a band p ass resp onse.
PFL (pre-fade listen)
a fu nction that allow s the op erator to m onitor the p re-fad e
signal in a channel ind ep end ently of the m ain m ix.
rolloff
a fall in gain at the extrem es of the frequ ency resp onse.
shelving
an equ aliser resp onse affecting all frequ encies above or
below the break frequ ency i.e. a highp ass or low p ass d erived
resp onse.
spill
acou stic interference from other sou rces.
talkback
the op erator sp eaking to the artistes or to tap e via the
au xiliary or grou p ou tp u ts.
transient
a m om entary rise in the signal level.
+48V
the p hantom p ow er su p p ly, available at the channel m ic
inp u ts, for cond enser m icrop hones and active DI boxes.
Pa g e 26
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