Brooks Cinema ZL 44 Amplitude

The strength of a vibrating wave; in sound, the loudness of the sound.

Current
The amount of electron charge passing a point in a conductor per unit of time.

Brooks Speakers Hum
The 60 Hz power line current accidentally induced or fed into electronic equipment.

Crossover
1) A route leading from one side of the stage to the other, out of the audiences view.
2) An electronic filter in a sound system that routes sound of the correct frequency to the correct part of the speaker system. Different speakers handle high frequencies (tweeters) and low frequencies (woofers). Sometimes known as a crossover network. An active crossover splits the signal from the mixing desk into high, mid and low frequencies which are then sent to three separate amplifiers.
3) An electrical circuit that divides a full bandwidth signal into the desired frequency bands for the loudspeaker components.

Brooks Cinema XR 607 Hypercardioid Pattern
A microphone pick up sensitivity pattern where the least sensitive pick up point is more than 90 degrees but less than 150 degrees off axis (usually 120 degrees).

Amplifier
A device which increases the amplitude (level) of an electrical signal (making it louder).

Equipment Rack
A cabinet with rails (or free standing rails) that have holes to accept screws at standard spaces and used to house outboard gear.

Compression Driver
The unit that feeds a sound pressure wave into the throat of a horn (in a horn loudspeaker).