From my experience Heil is know for AMT's. I'm not sure how they work, that's all I'm saying (I know nothing ). But the one's I've known of, compare to the ribbon tweeter principle now day's. But the Heil AMT's I've heard we're omni-directional's(360deg), and you could never blow them as long as they we're x-over at the recommend freq... This made room acoustics come into play as far the placement speaker's that are using the Heil AMT's. But it's been years since I've heard about them.
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). But the one's I've known of, compare to the ribbon tweeter principle now day's. But the Heil AMT's I've heard we're omni-directional's(360deg), and you could never blow them as long as they we're x-over at the recommend freq... This made room acoustics come into play as far the placement speaker's that are using the Heil AMT's. But it's been years since I've heard about them. 
