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On Tuesday, May 16, 2017 at 2:36:42 PM UTC-4, Ian Field wrote:

Depends what you paid for it - audiophools would go into shock at the
thought of NP electrolytics in speaker crossovers.

Anything decent will have some kind of metalised film caps - and you
don't
necessarily have to pay audiophool prices to get it.

Audiophools go into shock easily. Keep in mind how delicate a proposition
it must be to maintain their faith.

Many "decent" speakers have one/the-other/both inside. It is largely about
real-estate and price-point as well as how critical the value might be.
For critical and highly 'designed' applications, film caps are the only
way to fly. For things that are less critical, an electrolytic might do
just fine.

Allegedly; there's something about contact potentials with electrolytics.

If its real - there wouldn't be much mystery about it causing distortion.