Currently in my 1994 318i I have 2 Memphis 12in DVC Power Reference, Black coned with somewhat flat surface, silver baskets. Pushing those is a Kenwood KAC-301 excelon which pushes out about 600-800 watts when im running at half ohm, both dvc bridged then each woofer bridged at box and bridged at amp to = 1/2 ohm. Along with that I have a hiwave 1 farad digital capacitor, (doesnt seem to help a whole lot better, system still cuts out on low notes,
). All professionally installed and some of which installed by me. Component speakers are all infinity. CD player is a Sony CDXCA710X, which i might add is excellent for increasing highs and overall mid/treble sound. Im also setup and ready for another amplifier but for now ill hold off as id like to put more into the looks of my beam. Ill post pics soon.