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 |
| 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 | a fu nction that allow s the op erator to m onitor the p |
| 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. |
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