It would be a shame to modify the highly acurate M22s with resistors. If you've ruled out the blown tweeter theory, then you might want to look toward the recording. You know the old saying, "junk in junk out". Not to say that your prefrences in music is junk, but that the engineering of the recording may be crap. I suspect that you may be now hearing all of the warts and blemishes of the recording. I have many recordings that I can't stand to listen to because they are so poorly recorded but they were quite bearable on the car radio. Speakers, no matter how good they are, should not have to compensate for "hot" recordings. The ones that do often sound very veiled and distant.
