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The best approach would be to contact Polk's CS department at 1-800-377-7655 or send them an email at firstname.lastname@example.org they should be able to help. I believe there are some new replacements that should become available soon.
Hello there Kenneth,
My name is Sean and I am a current owner of a pair of RT800. I believe both of my tweeters are blown and I am looking for replacements which are currents. From what I understand, silk domes are being made which isfine with me. I appreciate any help. Thanks,