X-over freq for Pioneer supertweeters

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I searched the forums for this information but couldn't find it.

I have some supertweeters from Pioneer HPM-60 and HPM-300 speakers I'd like to put to use but I cannot find any info on their parameters. I know Pioneer used them as supertweeters in a four way configuration, presumably as an upper extension to the tweeters' response. Does anyone have any experience with them? What frequency range is acceptable for crossover?

The idea is to use them across the front in HT; two HPM-300 supertweeters for left and right and the HPM-60 for the center. Is this practical? Since I haven't gotten the drivers to partner with them for the lower frequencies, I have a fair amount of latitude.
 
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