Why don't you try them out on your pet cat? Cats can hear up to 64kHz.
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I've been playing the F-15s without a baffle on Ikea stools to break them in. Doubt very much if I will need a super tweeter though it might be fun to try a pair.
you probably read this already but this bloke is using those drivers just sat on a bench. Says he doesn't even feel the need to put them in a baffle:
https://hifiauditions.wordpress.com/...ii-audio-f-15/
They do sound very good naked, surprisingly so. However, they need to be in a baffle, not only to avoid wave cancellation, but also to position them correctly for optimal listening.
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Hi Geoff, hope you're keeping well.
Any updates on the project?