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A preamplifier, also known as a preamp, is an electronic amplifier that converts a weak electrical signal into an output signal strong enough to be noise-tolerant and strong enough for further processing, or for sending to a power amplifier and a loudspeaker. [1] Without this, the final signal would be noisy or distorted.
A microphone is a transducer and as such is the source of much of the coloration of an audio mix. Most audio engineers would assert that a microphone preamplifier also affects the sound quality of an audio mix [citation needed].
An important limitation of a real amplifier is that the output it generates is ultimately limited by the power available from the power supply. An amplifier saturates and clips the output if the input signal becomes too large for the amplifier to reproduce or exceeds operational limits for the device.
More complex amps add Treble, Bass, and Middle controls. Some high-end amps have elaborate multiple-band audio equalizers. It is important to note that passive tone controls--like those found in guitar amps--do not increase the volume of their respective band controls. They can only serve to cut the gain in a particular tone range.
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