The way your PA sounds just before it blows up. Fuzzy and scratchy. If you hear this, it either means you have something hooked up wrong, or something in the system is going bad. It could be anything from your super expensive soundboard to a five dollar patch cord.
Ground Loop
A double grounding of a line or electronic device at two different "ground" points of differing voltage.
Brooks Hi Fi speakers Auxiliary Input or Return
A route back into the sound desk for a signal sent to a piece of outboard equipment via an auxiliary send.
Chord
Three or more musical pitches sung or played together.
Brooks RM 909 Analog Recording
A recording of the continuous changes of an audio waveform.
Line In (Input, return)
Where a signal enters the board or component.
Earth
The British version of the term Ground (In electronics, a place that has zero volts).
Filter
1) A device that removes signals with frequencies above or below a certain point called the cut-off frequency.
2) An equalizer section, used in this sense because filters are used with other components to give an equalizer its frequency response characteristics.
3) The action of removing signals of some frequencies and leaving the rest.
4) A mechanical device to smooth out speed variations in tape machines called a Scrape Flutter Filter- more usually called a Scrape Flutter Idler
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