I'm trying to design my theater system to have two towers, which would also house my regular 4412's for use with music, as well as house a pair of 2245's. 18" in enclosure depth (inside volume depth) would be perfect for where these are going. In order to achieve the 14.13 cubic ft woof volume, I'm ending up with 6 3/8 depth at the upper section, behind the 4412's and 4408's. Is this a bad thing to do, shape wise, or is the volume amount all that is important?