SDA-SRS Crossover details

New to Polk SDA SRS ownership, I absolutely LOVE them. I pulled out crossover to examine them and the caps look pretty good(no leaking), but I have never seen giant spools of wire like the 3 that are on each crossover. Can someone tell me what they do? Also, are the crossovers for the various SRS (1.2, TL, etc) all different or the same? Thank you!

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