[Cyan]

What do you think about the amt tweeters? Why don't you use them in your speakers? Do you think that your normal ribbon tweeters sound better than the amt tweeters? Becuase i see that ribbon tweeter are much cheaper than amt tweeters. And if there is not quality difference then the ribbon tweeters are of course better.

[DMurphy]

I've used small versions of the AMT that I didn't like, and the larger "regulation" AMT, which certainly has virtues.  It can be crossed very low and is quite linear.  It's main drawback, besides size and expense, is limited vertical dispersion.  As I recall, I used it in a design with a dipole midrange, and it was pretty tricky to get evrything working together.   I think Jim may have another custom job with the AMT coming up, and I'll get another crack at it, maybe in a conventional design.