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RE: Alternative to the EV ST350 horn tweeter on EV Sentry IV-A's

Posted by Geary Lyons on October 28, 2013 at 23:12:02:
Paul,
I am going to stick to the stock ST350's. The EDS that grindstone posted shows 3 alternative XO/EQ examples. 3kHz, 3.5kHz, (X36) and 6kHz. I could go to a 3.5kHz, Linkwitz-Riley alignment, (that is what the X36 appears to be, then add the EQ, but that is more components in the signal path. And I would have to buy new air core inductors. Also, I am concerned with taking the ST350 that low without the tweeter protection circuit, which adds even more! In your opinion, should I be concerned?
This is the 3kHz:

I like the current 4700Hz, but you shared some concerns. Since 4500Hz is 1/2 octave above 3000Hz could I not just multiply these values by the SQRT of 2, (1.4)? That give me a C 3.4uF and the L .448mH. That calculates pretty close to a straight Butterworth filter at about 4100Hz, so I assume the EQ is from the filtering of the 3kHz hump in the raw FR.
The 6kHz example has me confused. My electronic mathematical skills are limited, but if I am reading this correctly are they saying to parallel 3 inductors to have an effective inductance of .12mH? .

Here is my confusion, .12mH in the crossover would not get a filter anywhere around 6kHz. Am I missing something here?
The 3kHz bumped half an octave seems the cleanest alignment, with the fewest components. (And close to good foil inductors that I have to hand!)
Is my logic faulty on the "bumped" component values to get to approximately 4.5kHz AND have the desired EQ?
I really appreciate your, and everyone's, input on this Sentry odyssey!
Cheers,
Geary