Brooks KS-55 Ground Adapter Plug

Adapts a three pronged electrical plug to a two pronged wall outlet. This bypasses the ground and may create a hum in the system. A lack of a good ground can cause mild electrical shock when touching a microphone.

Ground Lift
A switch that breaks the connection between the ground point in one circuit and the ground point in another circuit.

Brooks QS 70 Compression Driver
The unit that feeds a sound pressure wave into the throat of a horn (in a horn loudspeaker).

Bi
A prefix meaning two.

Brooks GT 44 Automatic Gain Control (Automatic Volume Control)
A compressor with a very long release time used to keep the volume of the audio very constant.

Gain
1) Knob usually found at the top of each input channel on the soundboard. Used to set input levels of the separate channels to relatively equal positions.
2) The amount of increase in audio signal strength, often expressed in dB.

Crossover, Active
A rack mountable unit used to separate frequencies leaving the soundboard into high's, mids, and lows with different outputs for each.

Line Out (Line Output)
Any output that sends out a line level signal, such as the output of a console that feeds a recorder.