car subs for a home system is a bad idea all car subs use cabin gane to get the last octave. ht subs have a lot lower fs or their resident frency. home subs are ysaly under 22 and car subs are usaly 28 to 30
check out
http://www.ascendantaudio.com/ they are clearing out their subs for a new design caues adrale audio who lisens xpl was saying