AlKit

The wall won't vibrate...at least not much, it's mostly concrete.

The foam is deep enough for the typical wall receptacle box. The foam is cut where the wiring goes and allows the sheet rock to go over it all smoothly.

The concern is that if the sheet rock if firmly applied to the foam block, that the speakers bass reflection won't be satisfactory.

The blocks come with 2 1/2" of foam as the design. Are you suggesting additional foam, or just apply sheet rock in the regular manner and leave the corners like the rest of the structure?

I'm not planning to fur them out...rather screw the sheet rock firmly to the foam form. Traditional wood framed ceiling, yes...

The typical wall finish for the ICF will be sheet rock screwed to the foam that makes up the concrete form...because of this the sheet rock will not really resonate (reverb or whatever) at all, and I don't think it will produce much bass effect. The ceiling will be more typical with joists and sheet rock. What do you think? Make a false corner for the horns? I appreciate the replies, thank you.

I'm about to add to my house and finally get a dedicated media room. As I'm building with ICF walls, I expect to have the Khorns in the corner of a very sold wall...I don't expect it will be good for base response-reflection. Any ideas on building false corners to use in this application. I've seen the diagrams to build them out of 2x4's and plywood, which is what I'm considering. Thoughts? Thanks, Al