[nicoff]

To the OP: This site is primary an audio site. In the forum thread below (from a home theater oriented site) several folks share ideas on the best way to accomplish what you want for your home theater.

In that thread there is a link to a site that describes baffle walls. Those are very common on THX certified theaters and may be a solution for you.

Here is a quote about waffle walls from that site:

“A baffle wall is essentially a false wall into which the screen speakers (i.e. left, center and right) are mounted. It is a core component of a THX certified cinema.”