The Heil AMT1 towers I bought in 1974 had a fine-sounding Heil tweeter and good bass via a tall transmission line reflex enclosure. Much better than the Advents & ARs typical back in the day.
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Yes, I had ESS Heil amt's back in the 70's. One of the best if not the best speakers I ever owned. The amt driver was the best tweeter I've ever heard. Crystalline, clear and a lot of air. The build quality, wood cabinets, beautiful. I'd actually forgotten how good they were. Caveat: I have not heard the modern ESS Heil speakers, but if I were you and had experienced "awesome sound" as you say, already, I would give serious consideration to a purchase.
I too lived the glorious Heil 70's experience. My roomate had the AMT???, the one with the TL box which exuded lows from another planet. We ran them with my Marantz 1060 integrated amp. Their overall sound has probably been my guiding force in overall audio system excellence. Well, three and a half decades later an outstanding 60 watts system has turned into a similarly outstanding 3000 watt system, same undying passion, different times, more resources. It's just the greatest hobby ever! That's my experience. I think the bottom line is the horn without the honk is called ribbon.
I had a pair of ESS Heil AMT 1b's new from about 1978. They sounded great especially for Rock music. I drove them at the time with a HK PM660 integrated. From a audiophile standpoint there was a bit of a rough spot in the crossover from the mids at the bottom end of the air motion transformer unit to the bass cone driver but, back then, who cared?! The Heil tweeter was so fast that nothing really mates with it seamlessly. These Speakers made it through my college days. They were bullet proof.
Heils...excellent for their time, but not out classed by new speaker tech. My father has the top of the line Heil (Heil Tweeter, 6" midrange and 2 x 10" woofers). We did an A/B listening session against the PBN Montana SPX (traditional dynamic speaker) and the Heils were out classed in every way.
The new Heil offerrings are the way to go. Midranges have improved greatly and can keep up with the Heil.