Theaudiotweak, it looks like you were right on with your suggestion about treating the upper walls. I just got finished building more panels for the front wall behind the speakers. These run along the border between the angled ceiling and the wall, are 18 ft wide, 33" high in the middle, and taper down to nothing as you go left or right. Height is 9-12' above the ground. Great results: this totally killed the rising ringing sound I was hearing with hand claps.
I am now able to hear a little more depth and detail, and some of the sibilance in my favorite recordings seem to strike quickly and not linger on like they used to. Thanks for the advice, everybody!
Bill
I am now able to hear a little more depth and detail, and some of the sibilance in my favorite recordings seem to strike quickly and not linger on like they used to. Thanks for the advice, everybody!
Bill