The tweeters Joachim Gerhard used for his Caldera (Audio physic) were preselected by Scan Speak. He discoverd by
Scan speak that the ladys invoved in production were not
equal. The difference? 1/2 -3 dB. So he wanted and ordered
those made by the 'super ladys'. By Revel's more expensive
speakers the tweeters are matched to 1/2 dB. This, I assume, should be also the case by Usher 'BE' versions. Ie
by adjusting and voicing of the crossover. The arbitrary
pair of the DMD tweeters wich you buy for,say,$700 may not
be matched in such a way as pair and are certainly not matched with the individual crossover wich is in your speaker(s).
Regards,