System synergy and room characteristics will influence your results to such a large extent that only an in home audition of the amp(s) under consideration will be of any value.
Expand the options and consider biamping with an outboard xover, tubes on top, SS on the bass, and xover a sub at 40Hz, say a pair of JL audio subs. A big room can now be filled.
The 3.7s do not have an external x-over box. Thus b-wiring or biamping can only be accomplished after major internal modification of the speaker, which would void the warranty.
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