Hi all! After finally upgrading the amp on my system (I bought an Adcom GFA-5400), I decided to listen to my MartinLogans at full sonic blast. Something weird happened. The mids. They are terrible at high volume. They sound so harsh, they hurt your ears. It's as if they developed a resonance I had heard before, but now, with the higher power rating, it's even worse. I have been thinking about what could be going wrong. Here are the options I have thought about. 1) The speakers are damaged. Highly unlikely, because *both* speakers would have to be damaged at exactly the same point, because both sound identical. 2) My room is too "live". The back wall is made of heat-treated bricks (ie, not porous, but ceramic-like). The side walls are carved stone. Right in front of them, a glass table might not be helping much. 3) The preamp I'm using (the variable outputs from my Luxman CD player) is not up to the challenge of powering the Adcom. I have never seen the amp distort, BTW (it has LEDs in front to tell you if you are overdriving it. Any ideas? I'm getting very confused here as to what is wrong with my system. Thanks!