Swapping Paradigm studio 100 tweeter to Beryllium

Just a quick follow up. A few months ago a repeat customer paid me $550 to trade his stock S8 v1 G-PAL tweeters for beryllium v2 upgrades. He loved the improvement, but due to the birth of his first child he decided to downgrade to a pair of $500 speakers. At this time he sold me the S8s, I thought they sounded much better than they had when I heard them stock, in my opinion it is a no brainer mod for the S8 v1. 

So I just sold these to a customer on October 14th and he was absolutely blown away, it was love at first note. How much you ask? Well just this past week he came back and bought a pair of Studio 100 v2 that I had upgraded to Signature v2 beryllium tweeters, Studio v4 mids, and Signature ADP3 bass woofers. He is now in love with both pairs and is enjoying them together in a multi speaker stereo (dual speakers on each channel) music only system.

   I thought the used Avalon Acoustics Eidolons that replaced my Studio 100s were overpriced. With a pair of S8s on hand for audition, within the the first few minutes my family insisted on keeping the Eidolons.
   After living with three iterations of Paradigm I would always hear each individual driver doing its job. In a brief listen with Audio Research fed Persona flagship it was the same thing made worse by their onboard powered subwoofers which were improperly located for that room.
   I can't hear the individual Eidolon drivers unless I put my ear right up next to them. What do they call that?  

I have Persona 9h...and after running ARC Genesis software the bass is perfect...and this with only 25w SET amplifier.