I would look at north creek music site and read all you can about coils they make a lot of good points. www.northcreekmusic.com
Alpha-core or perfect lay inductors for upgrading?
I'm trying to find out if one type of inductor is better suited for one application than another...one for the mids and a different type for the woofers. Are Solen Hepta-litz air core one of the best available? How do they compare sound wise to Alpha-core inductors?