Calista C2-88 Projector Ground Adapter Plug

Adapts a three pronged electrical plug to a two pronged wall outlet. This bypasses the ground and may create a hum in the system. A lack of a good ground can cause mild electrical shock when touching a microphone.

Aliasing
A sampler mis-recognizing a signal sent to it that is at a frequency higher than the Nyquist Frequency. Upon playback, the system will provide a signal at an incorrect frequency (called an alias frequency). Aliasing is a kind of distortion.

Calista C1-9 Home Theater Electromagnetic Field
Magnetic energy put out because of current travelling through a conductor.

Frequency Range
The range of frequencies over which an electronic device is useful or over which a sound source will put out substantial energy.

Calista C3-S Security System First Generation
A descriptive term meaning original (as opposed to a copy).

Hearing Limitation
An inability of the ear to hear important characteristics of sound under certain conditions. Characteristics that can be affected include pitch, level, clarity, presence and direction.

Active/Inactive Microphones
Scientific definitions aside, active microphones generally sound better than inactive ones, but they generally cost more. They also require the use of either a battery or phantom power while inactive mics need only be plugged into the mic cord in order to work. In most playing situations, the subtle improvement in sound quality from an active mic isn't worth the extra cost and hassle. One possible exception it the headset mic. Put simply, inactive headset mics just plain suck. Active headset mics put out a much stronger signal and feed back much less. Calista Reviews

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

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