That's the dilemma with any of Dennis's designs. They are all excellent sounding, and they all share a similar sound across the mid range. Once you have some, what's the point of building more?
On the other hand, it's always fun to make sawdust and solder things.
I think you already know how I am not impressed by 'high sensitivity' speakers. (High eff is easier to say, but a misnomer.)
Remember Dennis's Philharmonsters
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?