We've been slowly honing our new listening room for a few months now. One of the biggest issues lately has been an overly bright sound. The tweeters measure very smooth, so it seemed that we had a room problem rather than a driver issue. That problem was most likely our vaulted metal ceiling, that goes from about 11 feet at the sides to 14 at the peak. Paul S. suggested that I try a suspending parachute. So today I installed a surplus 15' dia. silk parachute at approx. the 8' level over the listening position and the gear. Quite a surprising improvement considering that the parachute is so thin that it's practically transparent. It sounds much more like a treated room and less like a warehouse. The nice thing is we still have a really nice decay into the large space.