Neil, I've demoed both 33s and 3100s (and own 33s). I felt that (having heard them in different rooms and situations) there wasn't enough extra (for me) to justify going the 3100 route given the significant difference in price (retail for the 3100s; used prices for the 33s).

I can't comment on 3200s vs. 3100s, the former which I've never heard and only have SpeakerLink inputs. IIRC though, they are a lot more sensitive than the rest of the older Meridian range.

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