I don't think you will have any issues with sibilance with the M3's as long as you are listening to good recordings.

Be sure to give them a good work out, with many different cd's. You can't judge them by just one or two songs.

I have heard the M22's and have M80's. The M3's are more "laid back" for lack of a better term.

I really enjoy my M3's for two channel listening without a sub. Hope you do to! smile

M80's(2), VP150, QS8's(2), M3's(4)