Brooks XT 20 Head Amp

British name for Preamplifier (A low-noise amplifier designed to take a low-level signal, such as the output of a tape head, and bring it up to normal line level).

Equalization
1) The process of adjusting the tonal quality of a sound. A graphic equalizer provides adjustment for a wide range of frequency bands, and is normally inserted in the signal path after the mixing desk, before the amplifier. See Feedback.
2) Any time the amplitude of audio signals at specific set of frequencies are increased or decreased more than the signals at other audio frequencies.

Brooks Cinema RM 909 Cable, 1/4 inch
An unbalanced cable most often used for instruments and patch cords. Commonly referred to as "guitar cords".

Circuit
1) One complete path of electric current.
2) Similar to definition 1, but including all paths and components to accomplish one function in a device.

Brooks QS 70 Level
Sets output volume of individual PA input channels. Usually positioned as sliders at the bottom of the soundboard.

Attenuator (Pot)
The electronic dohickey under the knobs that increases or reduces the strength of the signal running through it. When these get old and dirty, they can make popping noises or rumbles in your PA (As in "my pots are dirty").
Assign Tochoose to which place an output is going to be sent.

Fat
Having more than a normal amount of signal strength at low frequencies or having more sound than normal (by use of compression or delay).

Light Emitting Diode
A light that allows current to flow in one direction only and emits light whenever a voltage of a certain level or beyond is applied to it.