The only way to know for sure is with real measuring equipment and software. You can pick up a mic and mic preamp for under $200 and software like Arta you can grab for free.
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thanks for the answ---> I was more interested in theory----> 2nd part of the question (could not seem to write more then 10 lines????
Looking at he impedance curve which goes up at about 30 degrees from 200 hz on ,do I still have to put a Zobel filter on that aplha when I cross over at 135 hz to control the rise in impedance ( because I'm not using that part of the output , 300 to 3000 hz , of the alpha ) ?
Somebody is probably going to suggest to go second order to avoid all of the above but then I have to deal with phase shifts
And last but not least------> mixing different orders of crossovers ,( first order on the woofer third order on the mid and fourth order on the tweeter , just to grab different orders out of the bag ) on a three way speaker creates nothing but a phase nightmares ?
Hope this finds you in good health and thanks if I get an answ