I have for sale an almost brand new Navone N-332V stereo line-driver signal booster. This little puppy can boost signal up to factory settings off a sound card - so your car's Amp can read it (what i was using it for), or to power a small speaker (center speaker in a 5 Ch surround set up), or to boost an mp3 player louder if the signal is weak. David Navone sells high quality stuff, and this is no exception - check out his website for more info:
CLICK ME
This amp sells on his site for $55 plus shipping, its yours from me for $35 shipped.