Put a bass box in ya boot running off an amp and keep speakers running just from your head unit but with no bass. Trust me, it will sound pretty damn good!!
Mine consists of
Sony Xplod 50watt x4 H/unit with 6 disc mp3 changer in boot
2x 300 subs running off a sony xm 440 amp (2 channel)
All standard interior speakers (including tweeters) running straight from H/unit with bass turned off to them.
Sound crisp and cool
