Tell me more tell me more "APT SVT" what are the names of those 8" 8"xmax drivers. The 6.5 inch I am currently using is the AudioBahn AMD60 if I remember correctly and lots of bass I get only when the source material contains it in the frequency in which it is boosted 50HZ. Ohh I am also thinking of adding another line driver for greater bass boost only this time with a volume boost control near the head unit so that I may adjust when the tunes requires it.