I have very similar room and ceiling issues and have found that the most effective way to defeat reverberance is with floor-to-ceiling tube traps. This is not likely to be an option for you, but an inwall treatment like the Corning system may work. The ring is flutter echo, and usually occurs between the floor and ceiling at places where the floor is uncovered hardwood. You can place absorbers (more rugs) at those points, or better yet diffusors, once you have identified the surfaces responsible. I was able to cure a considerable amount of ring by placing a 3'x5' rug on a part of the hardwood floor where the ceiling was focussing energy.
Panels to treat a vaulted ceiling?
My listening room is 16x23 with a vaulted ceiling, hard floors, hard walls and sometimes hard to listen to. I listen across the short side of the room using only 2/3 of the width leaving the highest part of the ceiling about a foot to the right of the right speaker. Book shelves and a large rug have tamed the floor and walls. All is well at low listening levels but how do I control the ring and echo that 400 square feet of ceiling produce at high listening levels. This is the only room that gives me a problem. I saw the spell check thread a while back and hope I have not misspelled ceiling a half a dozen times.
Thanks for any suggestions.
Thanks for any suggestions.