check out the Walla Walla Wall of Sound from Lovecraft Designs (formerly Cain and Cain to Terry Cain's passing). High efficiency, designed by Gordon Rankin of Wavelength Audio and placed flush against a wall. The speakers are WIDE but very shallow (about 3ft wide but only 8" deep. There is a pic in the products section of the Lovecraft Designs website.
Good luck!
Jeff
Good luck!
Jeff