Deed any Usher BE-20 owner try the new diamond mid-range driver?

The ''upgrade story''. Joachim Gerhard was/ ís the most talented 
speaker designer in Germany. His Virgo was the cheapest
Stereophile A class contender ($5000). His next was Caldera
considered in Germany as ''measure of things''. But in USA 
someone discovered '' cheap wire''  inside the Virgo. So many
upgrades with ''expensive wire'' were started. Those who wanted
to know ''why'' used the oportuity to ask Joachim himselff. The
question to him was put more polite not as ''why deed you used 
those cheap wire'' but as ''why deed you use THOSE wire''?
''Well '' Joachim answered ''we deed try about 20 different wire
and thouth that ''THOSE'' soundend the best. 

I was not able to find diamond tweeter enywhere. So I will first
try to tame beryllum tweeter with extra resistors. I think that Usher
strategy is to sell the same speakers with new drivers instead to
sell drivers as separates. The difference in price is +$5000.
''Beryllium'' was a kind of ''fake beryllium'' so this may also be the
case with ''diamond'' drivers. Besides there was no consensu among
members in the ''old discussion'' reg. the tweeter about the question
which was better sounding.  

The crossover for both; BE-10 and BE-20 is designed  by
Joseph D' Appolito. World authority reg. crossovers. To ''improve''
those huge amount of arorgance is needed. But American and
European versions are ''tuned'' + 3 dB above 35000 Hz. The
assuption was that ''óur tastses'' need  this. H. Pearson refused
to review the BE-20 for this reason. Assuming that my assumptions
are true I am willing to invest in ''some'' ( 2 per side) resistors for
the (beryllium ) tweeter. 
The other approach is like by speakers: changing ''cheap wire'' for
''expensive kinds''.