inductor

Hello, I am new to the DIY speaker building craze and am working on my first set of main speakers. I have selected Zaph Audio 5.5tt due to its smaller size and have been working on the list of items I will need for the crossover, which brings me to the questions I have. The crossovers call for...

Is there any audible improvement to using foil type inductors like Alpha Core over air core types like Erse XO series? If so, in what respect is it better?

I am building a crossover and found the proper size .3 mh and the proper wire gauge inductor but the resistance value is supposed to be .2 ohms and what I have is .3. Will a tenth of an ohm cause any problems?

on the inductor for a mid woofer what is important a low DCR or kind of iductor. example the Madisound Sledgehammer 1.0 Mh has a DCR of .1 but the supposedly superior Alpha Core Goertz has a DCR of .188. Does it matter that much, is there an audible difference between the laminated and foil...

I am currently making some super frugal MTM's for my theatre (wanted something different) but due to cost I am going down the old path of passive xo's. Whilst playing around with attenuation, BSC, notching and zobeling I decided I would do that once the unit was together etc etc etc, you know...