"None of these have an effect on the tweeter"

I was upgrading components based on feedback from the dealer that I was feeding the KEFs crap.

"Good move. Any results? Of course it is not blowing when you are looking "

I posted somewhat extensive test results on the diyaudio site (search for Lamepops if you want). I checked several frequencies between 100 Hz to 16 KHz at 1/4 and 1/2 volumes with no signs of distortion (did the same checking with actual music). I also put my 8-ohm dummy load in parrallel with the old Technics speakers (to simulate 4-ohm operation), and ran the volume up to 3/4 (!!) and saw no sign of distortion.

"Did you take your amp that drives the kef? Is it able to handle such a low impedance load? Does the tweets blow on any music or movie or just one or couple?"

The exact setup (my Adcom amp, my KEFs, everything) performed flawlessly for over an hour at the dealer. It took less than 5 minutes to damage the KEFs at 1/4 volume in my home. That's why I think it is environmental. I only use my system for music...and I listen to lots of music...from old Genesis to Type O Negative.

"What does the dealer or KEF has to say on this? Did you call KEF?"

I have been told from the very start that I needed to provide more clean power to drive the KEFs, and this was reinforced by the dealer's demonstration of my KEFs on his Mcintosh system, operating between 40 and 400 watts. It was really f****** loud...much louder than I have ever played them. I have not spoken with KEF directly, and the dealer has mentioned that this would be the last repair/exchange for free. That's why I'm going to sell them....because I have not found the root cause. I am supposed to be receiving a brand new 2004 model this week.