John, I had Cremona M, Amati Aniversario and Elipsa SE and the high freq. of the Guarneri Evolution for sure better than Cremona and in my system has been better than other two - its more natural and airy. It may be dealer's set-up and room, cables, equipment. Also Evolutions are famous for their great bass , but room size matters a lot. I personally think that ARC ref. 75 may not have enough power to drive Evos. May be you can ask dealer to run them with good SS amp and different CD player. What cables has been used?
I did numerous comparisons of the Cremona and Guarneri models and overall the Guarneri is in a different league. The price I saw on the A-gon for brand new, sealed in box pair of EVos is a very good one.
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