The components in any decent crossover are probably perfectly up to the
requirements for the job. What kind of substitution did you have in mind
and
what improvements were you anticipating ?

Graham

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I had nothing in mind but I've heard people replacing the electrolytic
alcaps & iron core inductors for the likes of Wilmslow audio super caps or
mundorf silver/oil caps & air core inductors from the likes of Jenson for
example. I don't know what to expect improvement wise as I've not
experienced how these components differ in sound & electrical
characteristics from the stock crossover items used. Claims are made for
better soundstaging, imaging, depth, neutrality, greater bass weight,
dynamics & so on. Basically quite a lot!

I would not say I am unhappy with my SBL's as they are but if I can get more
out of them for a nominal cost in comparison to thier price or using an
active set-up I would be more than willing to give it a try. After all no
loudspeaker comes near to perfection.