11.9 What is a preamplifier?
Description
This article is from the rec.audio.* FAQ, by with numerous contributions by Bob Neidorff others.
11.9 What is a preamplifier?
A preamplifier is an amplifying electronic circuit which can be
connected to a low output level device such as a phono cartridge
or a microphone, and produce a larger electrical voltage at a
lower impedance, with the correct frequency response. Phono
cartridges need both amplification and frequency response
equalization. Microphones only need amplification.
In most audio applications, the term 'preamplifier' is actually
a misnomer and refers to a device more properly called a
'control amplifier'. Its purpose is to provide features such
as input selection, level control, tape loops, and sometimes,
a minimal amount of line-stage gain. These units are not
preamplifiers in the most technical sense of the word, yet
everyone calls them that.
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