Custodian I asked the same question a few weeks back-do a search on Super Tweeters in the forums you'll find some good information.
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I have the ST-50 made by Tannoy and couldn't live without them. Depending on the frequency setting you choose, they can add a little sparkle to the highest treble, but no matter what cut-off point is chosen, the whole presentation becomes more liquid and musical with much bigger soundstage. Strangly enough, things also sound "faster".