Happy new year to everyone !

I am investigating the 075 uses and its crossovers....

my first question is: Is it correct to say that this tweeter has been used with only three crossovers , namely the N7000 which cut it at 7500 Hz, the N2400 which cut it at 5000 Hz and the N2600 which cut it at 10kHz ?

my second is on the shematic of the N2600 what is the "S2 ", please ?
Name:  N2600 XOVER.jpg
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