First of all let me say hi everybody, Im new to this forum. OK, so here is what I want out of the sub that Im going to build. The sub will be in a 12' x 20' room. Its use will be HT 90% / Music 10%. I have around $500 to spend on the woofer and plate amp. Box and finishing materials do not count towards the budget. WAF is not important. The only factor that limits how big it can be is the width of our front door. So given the fact that I am willing to build an 8 cubic foot enclosure are there any options that will allow me to feel the bass while watching movies? Basically I just want to be impressed by the bass when the movie calls for it. I have been lurking around the forum for a while and have seen a few popular combos. Shiva or Tempest + 250w PE amp Titanic Mk3 + 250w PE amp AV12 + 350w Rhytmic amp All can be gotten for well within my budget. Are any of them going to be enough to fill a 12' x 20' room? If not what will? Thanks in advance guys.