Brooks Hi Fi speakers Bottom

The bass frequencies (as in "needs more bottom end").

Humbucker
Pickups that are coupled together to get a certain sound.

Brooks RM 909 Axis
A line around which a device operates. Example: In a microphone, this would be an imaginary line coming out from the front of the microphone in the direction of motion of the diaphragm.

Keying Input (Key Input)
An input on a dynamics processing device to control the device by an external audio signal.

Brooks RM 909 reviews LED
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.

Cable, XLR
A balanced cable used for low impedance microphones and sometimes for connections between some parts of the PA. Commonly referred to as a "mic cord".

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

Diaphragm
A thin flexible membrane or cone that vibrates in response to electrical signals to produce sound waves. Distortion is usually referred to in terms of total harmonic distortion (THD) which is the percentage of unwanted harmonics of the drive signal present with the wanted signal. Generally used to mean any unwanted change introduced by the device under question.