I am building a home theater and have a Yamaha RXV2400 receiver w/Polk rti12 fronts, Lsic (center), fx5 surround and Lsi7 in rear. I have not found a sub I like so I bought a Qsc Rmx 1450 amp to push 2 subs. I have a large room and want a sub in each front corner. I wish to have the floor, walls and lights rattle when a Top Gun plane flies by, if you get my drift. I bought 2 Kicker c12 8 ohm and built 2 1.25 cf non-ported boxes per instructions, but I need more Rattle...what do you suggest? I was thinking of building 3 cf boxes and using ports or going to 15"...maybe Rockford or ???