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I don't know if anyone has directly compared them. The 170 and 22 are the two that are compared usually. Look for Curtis' review and a link to the LA net-direct shootout.
EDIT: Look on 2 page here at Reviews and Comparisons the thread is titled Internet Budget Review.
I have heard the the 340 and m22 side by side briefly.
The 340 is simply a bigger playing speaker, more bass, more fullness, more balanced. A better comparison for the CMT-340 is the M60 IMO. The M60 may have a little more bottom end, but I think the rest would be very comparable.
-curtis
Agreed. The M22 is more closely compared to the 170 than the 340. 340 is quite a bit more speaker than the m22.
-R