I can't imagine it's difficult to swap the tweeters, though I can let you know after this weekend!

Are you satisfied with the bass extension of the M3's for music? I was specifically thinking of the M3's vs. M2's/M22's as I will need to run without a sub for the upcoming bookshelf setup.

Dan
On-Wall M5HP LCR, QS8 & EP500 in 7.1