Pre Amplifier
What is the function of amplifier, pre-amp, equalizer in home audio system? Are they needed for good system?
An amplifier, or power-amp, supplies the power that drives your loudspeakers.
A pre-amp, or processor, does all the decoding of the incoming audio stream from the DVD/cable/sat/etc., adjusts volume, selects source, etc. AND sends it to the power-amp. [...]