For now I located the sub in the corner on the outside of the speakers, I plan on trying other locations later. As for now it seems to blend in good its just so much better than what I had before, I've just been enjoying how much better it is. As far as constuction it is 18*18*21 internal w/2 vertical braces with about 50% removed which I figured roughly at 3.7 cu. ft. it has 1.5 in. top, bottom and sides and 2.25 in. front and back. I also used a Art Of Sound amp. And this thing is HEAVY, in a pinch could also use it as a jack stand