Brooks XT 20 Crosstalk

Leakage of an audio signal into a channel that iris not intended to be in, from an adjacent or nearby channel.

Frets
Vertical metal wires which sit vertically on the guitar neck.

Brooks Cinema TX 509 ADSR
The letters A, D, S &R are the first letters of: Attack, Decay, Sustain and Release. These are the various elements of volume changes in the sounding of a keyboard instrument.

Balls
1) The depth and thickness of a sound, usually on the bottom end of the EQ (as in "needs more balls"). 2) The strength of the voice on the mic (as in "check it like you have some balls").

Brooks SS 81 Jack Bay
A series of jacks which have connections for most of the inputs and outputs of the equipment in the control room.

Crossover (Crossover Network)
A set of filters that "split" the audio signal into two or more bands (two or more signals, each of which have only some of the frequencies present).

Horn
1) The part of the speaker that emits midrange and higher range frequencies.
2) A speaker or speaker enclosure where sound waves are put into a narrow opening (by a speaker cone or driver) and the narrow opening flairs out to a larger opening.

Foldback
A European term for the signal sent to the stage monitors in a live performance.