Calista C2-88 Projector Ground Loop

A double grounding of a line or electronic device at two different "ground" points of differing voltage.

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.

Calista C1-9 Home Theater Compressor
A signal processing device that does not allow as much fluctuation in the level of the signal above a certain adjustable or fixed level.

Gain Reduction
The working of a limiter or compressor reducing gain during high-level passages.

Calista C3-S Security System Frequency
Practically speaking, high frequency means high pitch and low frequency means low pitch.

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".

Distortion
Usually undesirable result of overloading sound equipment. Reducing the levels can remedy the situation. Bose

Boom Stand
A microphone stand equipped with a telescoping support arm to hold the microphone.

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