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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