Richard: I do think that the room may be too small and you may have lots of problems. I would recommend calling Avalon directly, not your dealer, and letting them know what you intend to do and see if they think the speakers will work in your room. I believe they will be honest with you, they are very good guys.
Good Luck,
Jonathan Tinn
Evolution Acoustics
BTW, 15' away is way too far in that room.
Good Luck,
Jonathan Tinn
Evolution Acoustics
BTW, 15' away is way too far in that room.