QUOTE (kavis @ Oct 24 2009, 08:38)

When I heard monitors with ribbon drivers I was surprised more clear sound. Its really due to technology. But this type of drivers has a lack - less radius of action (little angle). When you move more to the left or right side - fail preference of it. What you can say about this type of twitter.
AMT/ART tweeters are not exactly ribbon tweeters, but at least to me they produce very clear sound. It may have something to do with their very linear phase. I don't know. But as I said, I think that they really shine in reproduction of sounds rich in harmonics - this is why I suggested auditioning ADAM monitors with piano, percussion and harpsichord. Of course in general timbre (which is a perceptual quality that relies much on upper harmonics) is reproduced very well. I do not notice much problem with directionality of my ADAM tweeters, moving around causes probably more variation in the lower range due to room interaction, and obviously, in source localization ("soundstage"). Maybe it's more of a problem with classic ribbons. The other thing is that you typically would not walk around the room while doing audio production.