Hi Dan,
This thread and your tweeter problem is really puzzling. You could isolate the problem immediately to either the Blu-ray recording or the tweeters if you have good headphones, which can reveal inherent distortion on recordings faster than using loudspeakers. Turn off the M22s and listen on the headphones. If you still hear the distortion, then it's on the Blu-ray master (not unheard of; I have a number of CDs where you can hear the mike inputs clipping). If you don't hear the distortion, then it's the tweeters.
If the problem were the tweeters, you'd hear the distortion with other CDs. Have you tried other material?
Regards,
Alan
