Just wondering how the soundqubed HDS315's hold up. I'm thinkin about running 4 of them in my 96 Tahoe. The box I'm planning to use is 48x44x15, port is 13.5h x 13w x 20l for a 32.42 hz tuning at 14.61 sq in per cube of port final volume is 12.01 cubes. Haven't decide what amp or amps I want to use yet, any suggestions under $1000?