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Preamps

A preamplifier takes the line level signal from your instrument and increases its electrical strength. It can also sweeten your tone (if desired) by applying EQ (equalization) to it. This can be as simple as treble and bass tone controls, or as complex as a multi band parametric equalizer or even the Fishman Aura, which electronically simulates the tone of different great studio mics.

The power amplifier then raises the preamplified signal to the point that it is able to move a speaker, which converts it back into moving air.

A preamp is highly recommended if you have put a piezo pickup on your acoustic instrument. By nature, the crystal structure of the piezo gives a brittle tone. Using a preamp allows you to warm up your sound. Some simply mount to your belt with a clip, others are boxes that can be put on top of your amp or on the floor.