Michael Percy sells silver ribbon air-core inductors.You will need to check with him for values.Might not get large enough for use in bass crossover.
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?