Calista C3-S Security System Figure Eight Pattern

Another name for Bi-directional Pattern (microphone pickup pattern picking up best from the front and back of the diaphragm and not picking up from the side of the diaphragm).

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

Calista C2-88 Projector Bi-Directional Pattern
A microphone pick up pattern which has maximum pick up directly in front and directly in back of the diaphragm and least pick up at the sides.

High Impedance Mic
A microphone designed to be fed into an amplifier with input impedance greater than 20 k ohms.

Calista C1-9 Home Theater Beat
1) The steady even pulse in music.
2) The action of two sounds or audio signals mixing together and causing regular rises &.falls in volume.

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

Group Master
A slide control used to send out a control voltage to several VCA faders in individual channels, thus controlling the gain of several channels. Bose

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

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