Brooks HI FI projectors Full Range

Describes a sound which covers all audible frequency ranges. As in "full range speaker cabinets."

Attenuation
A making smaller: reduction of electrical or acoustic signal strength.

Brooks Hi Fi speakers 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.

Contact Microphone
A device that senses vibrations and puts out an audio signal proportional to the vibrations.

Brooks RM 909 reviews 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.

Electricity
Electrical current (the amount of electron charge passing a point in a conductor per unit of time) or voltage (the force pushing electrons to obtain electrical current).

Half Step
A pitch difference of the amount that is present between adjacent keys on a piano.

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".