The strange world of being an audiophile has led me to these interesting but strange Supertweeters which I recently purchased from TaketT in Japan. You can read about them here.
http://www.taket.jp/batpure/batpure.html
I attached them to my speakers in rather a rough fashion just to get an idea what or if they could add anything. They did but in a subtle but very well integrated way. One of the strangest tweeks I have ever come across operating in the 20Khz-150Khz audio band but also helping out across the frequency range. You can't hear them if you just plug them in but working with your speakers they add some acoustic magic. Hard to describe but 'air' and 'space' and a vitality that makes vocals and instruments sound more real and three dimensional.
Weird but worth it for £40
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