Meadowlark Blue Heron - lots of questions

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After reading about the Audax tweeters I did some general web searching. One of the reasons cited for a lack of treble with these tweeters is a tendency to leak nitrogen in early examples which causes the output to diminish. Perhaps this is a reason for the low treble output?

Nigel
 
I have made a substitution of Audax 'golden egg' tweeters in a big Meadowlark (dont remember the type its 2 yrs ago, but it had 2x10'' woofs, TL, plus additional low mid- high mid -high very heavy cab). It used probably custom woofs with huge magnets, Scanspeak low mid, HM100Z0, and HD3P. The piezos had lost pressure. The cross was 7khz 1st order as I recall measuring it. When they lose pressure they lose dBs. A friend of mine also had 4 same piezos in storage and found them like that after 5 yrs. He got angry.
I used Audax A26 tweet that had strong last octave and was 100mm overall diam so it could fit snugly. Had to measure and listen a lot but the owner got very happy. He mentioned it was a circa 20K$ speaker he bought second hand in the U.S. It had Auricaps and Caddocks in its crossover. I used Auricap for the substitution cross section again.
 
Found em on the web. It was the Nightingale model actually.
 

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