Might I suggest you consider building your listening room to the golden ratio, which is 1.618:1? This would require minimal physical, but acoustically significant changes to the proportions of the room to avoid standing waves and enhance the sound at all frequencies and locations in the room.
To modify your present plans to the golden ratio, you could modify as follows:
If your longest dimension must be 22 ft, your short dimension would be lengthened to 13.6 feet and the ceiling would be 8.4 (~ 8' 5") high.
If 12' must be your maximum width, shorten the long dimension to 19.4' (19' 5") with a ceiling height of 7.4'.
This should make the speaker/room interface easier to tune, minimize standing waves and sickouts, and require less room treatment for a full, natural sound that is consistent throughout the room.
After all, George Cardas built his cable company on this principle.
To modify your present plans to the golden ratio, you could modify as follows:
If your longest dimension must be 22 ft, your short dimension would be lengthened to 13.6 feet and the ceiling would be 8.4 (~ 8' 5") high.
If 12' must be your maximum width, shorten the long dimension to 19.4' (19' 5") with a ceiling height of 7.4'.
This should make the speaker/room interface easier to tune, minimize standing waves and sickouts, and require less room treatment for a full, natural sound that is consistent throughout the room.
After all, George Cardas built his cable company on this principle.