Brooks Cinema XB 33 Ground Lift

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

Hertz
The unit of frequency. Equivalent to cycles per second. Abbreviation: Hz.

Brooks VT-50 Amplifier (Power amp, Head)
It's the part of the sound system that actually magnifies or "amplifies" the sound. In other words, it makes stuff louder.

Console
A set of controls and their housing, which control all signals necessary for recording and mixing.

Brooks QS 70 Leakage
Sounds from other instruments and sources that were not intended to be picked up by the microphone.

Fletcher Munson Effect
A hearing limitation shown by Fletcher Munson Equal Loudness Contours (as music is lowered in volume, it is much more difficult to hear bass frequencies and somewhat harder to hear very high frequencies).

Acoustic/Acoustical
Having to do with sound that can be heard by the ears.
AcousticsThe behaviour of sound and its study. The acoustics of a room depend on its size and shape and the amount and position of sound-absorbing and reflecting material.

Inverse Square Law
Simply stated, the fact that in an un-obstructed area (like an open field) the sound pressure level will drop to half-pressure (-6 dB) every time the distance to the sound source is doubled.