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So I finally got around to building a small test box for this AMT tweeter. Similar to what it would be in, if I ended up using it in my project. The AST series from Aurum Cantus are dipoles, so a box for me was necessary.

Frequency response in test box, roughly 2.5V/1meter, in-room, with a 450Hz 2nd order HPF.



Frequency Response with Parts Express Acousta-stuf polyfill. Was identical with Mundorf Angel Hair, for all practical purposes.


What I was interested in was if the box stuffing affected distortion performance. Here is what I found.

Felt pad in-place for one set of tests, then removed for the others.



20g Acousta-stuf vs 3.9g Mundorf Angel Hair. Angel hair looks like sticky icky itchy fiberglass. WRONG! It is the softest thing I've ever held, softer than a newborn baby! I just want to hold it up against my face, lol.










That bundle of Angel Hair was the same size as the Acoust-stuff, but it just keeps expanding and expanding to fill up all available space. I had to put it in the test box and seal it up because I thought it was going to engulf my whole room, lol.










Obviously not a huge difference, but I'll take it (and everything else) with Angel Hair! :)
 

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Really nice writeup. The AC AST have been my favorite tweeters for some time now. Any tests for CSD? My guess is that most of the audible distortion is from resonance and that felt pad helps. Would love to see an actual test.
 
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