Pioneer DEH-P6600 Car CD Player

I own two of these head units one in my Xterra and one in my Civic both of which I am extremely happy with. The Xterra has about 3000 watts worth of stereo equipment in it and only by certain chances do I skip a cd. In my civic I basically just have an upgraded stereo new speakers nothing extravagant, and figuring that I have a basic idea on how to tune an head units EQ (read the manual) about 2 minutes playing with it and it sounds beautiful playing everything from classical to rap back to hard rock, softly it contains every note there is to be played through your speakers (if they can handle it) loud it has enough wattage to over play a 150 watt max speaker it can cripple a stock speaker faster than you can spin the volume dial.