Hello, I need some advice on subs before I buy. Thanks in advance. I'm wanting to go with Fi subs, and thinking either 4 15's or 2 18's. dimensions of the area available without removing panels: 30Dx20Hx45W(approx). Here's what i'm working with: 2x Soundstream DTR1.3400D RMS Power Rating:1 ohm: 2200 watts x 1 chan.0.5 ohm: 3400 watts x 1 chan.thats each.