You might try RPG Skylines. They can even be (spray) painted to match the ceiling. I don't have them on the ceiling, but I liked their effect behind my listening position. I also found that RoomTunes corner diffusers are an inexpensive improvement. I think EchoBuster makes something similar. If you fear this kind of death-by-a-thousand-cuts approach, go for Tube Traps, which fix anything, but they are expensive.
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.