if distortion clipping is from amplfier than u need bigger head unit or an amplifier to drive the mains
if distortion is due to speakers than u mite wanna look into some new better ones
i suggest u replace ur speakers and add a amplifier for them
as far as woofer is concerned im not well imformed i tht regard but if ur not getting the base u wont then again look into something bigger better, BADSECTOR on this very forum gave some names model numbers and thr performance and prices so u mite wanna look into that
for low volume listenings a strocker/pump can greatly increase listening pleasure