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I believe it is best to use the same tweeter as originally cam with your speaker. That way it will remain well-balanced and match the other speaker. Give Polk's CS a call on Monday at 1-800-377-7655 and have a copy of your sales receipt on hand. They should be able to fix you up.
I have a pair of R40's, one unit with a damaged tweeter. Can you recommend the appropriate (or even upgraded) replacement Polk Tweeters? I want to replace both...