i was also thinking about making a 1000watt home/powered sub for my HT setup but i figured i should probably upgrade my car setup first because my HT is decent.
u can make any sub loud "for the most part" its almost all about the install. not s ure if u could find 12" mags but if u can id go that route. a single 12 mag will do over a 146 and sound good doing it.