I've aded some reference info. As you can see, this is an above fireplace application, so I am vertically challenged. The area is quite large > 4000 cu-ft and continues into the adjoining dining and kitchen areas. Based on the lack of walls and concern from the wife, the surrounds will definately be in-ceiling rounds.

Based on what I have seen from other posts, I'm hoping to get a lot of good advice from the forum.

Do you think I should repost under a more general heading than "in cabinet" to attract the other experts? Many thanks!