In an audio system, a preamp
is the name given the
first amplifier to accept the signal from a transducer such
as a microphone. Preamps amplify
a very weak signal to create a line
level signal. They must amplify the signal with a minimum
of additional noise and they must maintain the original shape of the sound
wave (i.e. not distort it). Microphone preamps can be found in mixers*,
audio and video recorders and as stand alone
devices. Mic preamps usually have balanced
inputs (xlr type connectors) though
lower end, home entertainment devices may use 1/4
inch or 1/8th inch phone sockets.
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