I recently auditioned this speaker and thought I detected a several DB roll off in the 50 kHz to 60 kHz region. Oh wait, that wasn't me....it must have been a bat.
The 19mm Accuton diamond tweeter used in the Eidolon diamond is rated to 100kHz. I assume the reference to +/- 1.5db refers to the tolerance of the driver pair matching, since I don't think I've ever seen a speaker response curve measure that flat.
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