Brooks Hi Fi reviews 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.

Atom
The smallest particle which makes up a specific substance. It's composed of a center around which electrons revolve.

Brooks RM 909 reviews Line In (Input, return)
Where a signal enters the board or component.

High-Pass Filter
A device that rejects signals that are below a certain frequency (called the cut-off frequency) and passes signals with frequencies that are higher.

Brooks RM 909 Early Reflections
The first echoes in a room, caused by the sound from the sound source reflecting off one surface before reaching the listener.

Crossover Frequency
1) The frequency that is the outer limit of one of the bands of a crossover.
2) In the Lexicon 480L delay/reverberation effects unit, the frequency at which the bass frequency reverb time is in effect rather than the mid frequency reverb time.

Full
A quality of the sound of having all frequencies present, especially the low frequencies.

Coax
Two-conductor cable consisting of one conductor surrounded by a shield.