Calista C1-9 Home Theater Diaphragm

A thin flexible membrane or cone that vibrates in response to electrical signals to produce sound waves. Distortion is usually referred to in terms of total harmonic distortion (THD) which is the percentage of unwanted harmonics of the drive signal present with the wanted signal. Generally used to mean any unwanted change introduced by the device under question.

Headphones
Devices that can be worn on the head with small speakers that fit over the ears (or sometimes into the ears).

Calista C3-S Security System Frequency Range
The range of frequencies over which an electronic device is useful or over which a sound source will put out substantial energy.

Expansion
The opposite of compression; for example, an expander may allow the signal to increase 2 dB every time the signal input increased by 1 dB.

Calista C2-88 Projector CD-ROM
An abbreviation of the term Compact Disc, Read Only Memory (A Compact Disc used to store digital data, such as large programs, that can be read by a computer).

Amplifier (Power amp, Head)
It's the part of the sound system that actually magnifies or "amplifies" the sound. In other words, it makes stuff louder.

Boom
1) A hand-held, telescoping pole used to hold the microphone in recording dialogue in film production.
2) A telescoping support arm that is attached to a microphone stand and which holds the microphone. 3) Loosely, a boomstand. Bose

Fader
A control to control the gain of a channel on the console, thereby determining the level of the signal in that channel.

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