yea. the box isn't deep and its abit small. right now fore daily i have 36x8(21n^2 per cube) in 13.5 tuned to 42. For SPL its 14ft^3 400in^2 tuned to 51. I've tried with and without pieces to reduce reflection/loading. the surround tore yes i reglued it, yes i do have some trapped pressure but the box is borderline to small so for now i have to live with it. i might have to step down to 15s to get better numbers but i love 18s cone area and the fact i can play 30 full tilt and they still get off.