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You are going to want to go a bit higher than 1khz on a pair of tweeters---unless you are intentionally trying to blow them.
they are passive crossovers. Nothing fancy about them. Not sure why you would use them over an active crossover though. To use those you obviously have a dedicated amp for the tweeters. If that amp was made in the last 10 years it likely has a crossover built in it.
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