Calista C2-88 Projector Active Crossover

Uses active devices (transistors, IC's, tubes) and some form of power supply to operate.

FOH (Front of House)
Refers to the speakers that face toward the audience. Also called the "main" speakers.

Calista C3-S Security System 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.

Echo Send
The output of a console used to send a signal to an echo chamber or delay effects device.

Calista C1-9 Home Theater Board
1) Another, less formal, term for Console.
2) A set of controls and their housing which control all signals necessary for recording and for mixing.
3) A slang shortening of the term Keyboard Instrument.

Distorted
The way your PA sounds just before it blows up. Fuzzy and scratchy. If you hear this, it either means you have something hooked up wrong, or something in the system is going bad. It could be anything from your super expensive soundboard to a five dollar patch cord.

Images
The squaring of the waveform that happens in the conversion of digital audio bits into analog signals. Bose

Electric Current
A more formal term meaning the same as the term Current (the amount of electron charge passing a point in a conductor per unit of time).

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