AVS Forum Special Member
Join Date: Jun 2008
Location: New Hampshire, USA
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First, I would not put the sub-woofer into the fireplace - instead build a end table or another piece of furniture in the room to hide the sub-woofer (or buy one that already looks like a piece of furniture if you are not the DIY type). Low frequency sound (below 80Hz) isn't easily localized, so you don't have to have the sub-woofer in front of you for it to sound right. This way you don't need to run power and speaker wires for the sub-woofer into the fireplace and you can lower everything else down.
Second, if you are putting the speakers in a 'cubby' you will still want to get in-wall speakers. Bookshelf speakers will not have the correct BSC if they are installed in-wall like you describe. You can buy in-walls to install yourself from places like Parts Express.
As jautor indicated, this install will put the TV higher than ideal. You'll want to put some effort into getting the TV as low as possible so you can watch it comfortably while seated.
Chris"It hurts to admit when you make mistakes - but when they are big enough, the pain only lasts a second."--Despair, Inc. "Regret"My AviaTrix TM Build