Just brainstorming form the floorplan... This is a short, interior wall, so if you don't have access to the top or bottom to drill into the wall cavities you're going to have to get creative.
It looks like you're placing the speakers very near to the corners. I don't know what this means accoustically, but you might be able to bring wire up inside corner trim pieces if you're careful about not nailing thru the wire.
Perhaps you could come up with a clever wall treatment or wall hanging behind the sofa to conceal wires behind.
Or finally, mount the QS4's on stands on either side of the sofa?
This will be an interesting listening arrangement. I'm no expert but I wonder how sharp the imaging will be with the wide open spaces on either side and behind the area. Can the kitchen or dining room be closed off from the A/V area?
-Brian
2xM60ti, 2xM3ti, 2xQS4, VP100, EP350, N2's
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