CactusBob,
Those look interesting, what do you think of them?
Hi Steve,
The Heil Air Motion Transformers are amazing. There is nothing quite like them in the world of HF drivers. I think you would enjoy some Frank cranked up with these!

I bought AMT 1's new in '76 which are a 2 way 10" woofer/Heil system, but they always lacked in the mid and bass areas. Having 2-10" woofers & a 6" mid keeps up with the Heil much better. They were the ESS Flagship model and I couldn't afford them back then. They were about $550-650 each. I'll have to bring them out soon. I actually owned 2 pairs of these in the last few years. But I parted with the other ones and kept this pair. Right now I'm running a pair of Altec 19's which are awesome. I'll post some more of my collection soon. I have some really cool vintage JBL's & others in the corral.
Cheers! Bob