I ordered 2 bookshelf speakers, that I plan on recess mounting into my wall. Basically I would build a little cubby hole in the wall (L & R of the TV) where I would place each speaker. It'd be only as deep as needed to set the speaker grill flush with the wall. And the cubby would be enclosed completely from the attic space behind it. However these speakers have a port in the rear, so I'm wondering if this cubby idea would be Ok and not affect the purpose\/sound of the rear port. Appreciate the thoughts.