got a techie question for you guys.... i'm running a 6 channel denon dca-800 amp. it's been with me for some years, i really rate this amp even though it's pretty old! do you think i may have problems if i uprate the head unit preouts to 5 volt? i think this amp was made when headunit preouts didn't exeed 2v..... any thoughts? does anyone have any tech spec on this amp? rms performance at 4 & 2 ohm? can't find nothing on the web.... i'm in the market for a used 12" sub. anyone got a kicker l5 or l7, infinity perfect 12, alpine type r, jl w3v2 or similar for sale?