Your room may be too large, but its description reminded me of this video.
The speakers in the video are listed here on Audiogon.
DeKay
Best Speaker for a reflective room ?
Looking for recommendations for speakers for a reflective room. Open-concept home in Florida - sliding glass door wall, ceramic tile floor, 14 ft ceiling. approx 20 ft wide x 30 ft long. Main living room so wife isnt going to allow treatments except a rug on the floor. Hegel HL590 with hifi rose rs150b. Budget: $30k. My system up north has magnepan 1.7s with a sub. Thank you!