What does a pre-amp do?


I am some what of a beginner in the hometheater world.I am looking to tweak my system some more but I dont know what some components do.My hometheater consists of the following.
Mitsubishi ws809 55" widescreen rp. tv
Denon AVR3802 reciever
Toshiba 5700 dvd with progressive scan
SLV-N81 sony vcr
Digital cable box
Boston Acoustic PV 600 Sub.
Boston VR 910 Center
Boston VR 950 Front right left Towers
Boston Micro 90 Surround right and left
Bose Rear center channel
So as you can see I could use some tweaks so I am trying to find out what a pre-amp. does.Any comments or recommendations would be greatly appreciated.
wwwjondon6f22

Showing 1 response by perfectimage

A preamp is also an amplifier. It amplifies the signal from the source to the amplifier. Percentage wise it amplifies the signal more then your main amp. It is probably the most underated piece of equipment in high end audio.