Okay well i sold two of my three 10" type-Rs, and the third im gonna put in my girlfriends car for her. I had the two 10"s in boxes to alpines specs, but seeing as im only putting 400W (alpine Mono amp) on this one, i was wondering if there is a better design, or at least box size. Alpine recommends 1.3 cubes. She has lots of room for something bigger. Ive been told that these like 32hz pretty well. How many cubes?