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Loudspeaker System

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This unprecedented loudspeaker introduced the revolutionary ESS Heil air-motion transformer to high fidelity sound reproduction and achieved immediate acclaim world-wide as the major advance in loudspeaker design of the decade.

By using the ESS Heil air-motion transformer for mid and high frequency reproduction, the AMT 1 broke free of past technological theory to achieve a transparency, uncompressed stereo imaging and dynamic transient impact beyond any previous high fidelity experience.

Completely unlike any loudspeaker that has come before, and already a classic, the ESS AMT 1 opens new sound vistas to music listeners.

All forms of distortion are gone; not only sluggish acceleration that smears the immediacy of percussive sounds, but the less immediately recognized motional errors that rob brasses of their sheen, strings of their guttiness, solo instruments of their natural ease, and turn an orchestra of individual instruments into a homogenized sonic haze.

The AMT 1 combines the original ESS Heil air-motion transformer with a specially developed ten-inch woofer that has an oversize, deep-drawn frame and high gauss magnet assembly for long, linear excursion at the highest possible acceleration.

A culmination of ten prototype designs, the ESS AMT 1 woofer achieves both powerful, impactful, low frequency response and rapid acceleration for crisp transient performance that blends precisely with the clarity of the ESS Heil air-motion transformer.

Revolutionary today and the standard of comparison for tomorrow, the ESS AMT 1 is the first authentically new approach to sound generation in fifty years. Every detail of the recorded performance is revealed with a degree of purity never before achieved and completely beyond the ability of all conventional systems.

Nothing we say, or can say, will prepare you for ESS AMT l's incredible high resolution sound - sound as clear as light.


Type: 2 way, 2 driver loudspeaker system

Frequency Response: 45Hz to 24kHz

Power Handling: 350W

Recommended Amplifier: 20W (minimum)

Crossover Frequency: 700Hz

Impedance: 4Ω

Bass: 10" cone

Tweeter: heil air motion transformer

Enclosure: ported

Finish: walnut veneer, hand oiled and rubbed

Dimensions: 31 x 14.25 x 14.25 inches


instruction/owners manual   English - montanama

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Reviewed May 03rd, 2015 by bigbmoonshine

These might be old school speakers now, but they still rock. Some of the best speakers I've heard; however, I've found the sound to be very directional - especially on the low end (9 out of 10). Besides that, they're right were they belong, (since I stole them from my dad) at my house. The sound is astonishing and crystal clear after 40+ years. After reading other reviews online, I'd have to say, if someone has a problem with the sound they're getting, it's their equipment not the speaker. We've driven these speakers HARD and there's very little, if any, noticeable distortion with full range. It might not be concrete cracking bass but I think they can be heard clearly from outer-space!

P.S. Would love to have owners manual. Looks like a xerox copy. If you see one or have one, please PLEASE please post. 1a or 1b manual as I have both.



re: AMT 1

So I have a pair of the Heil AMT-1s and know this little old lady who knew Oskar Heil. She has an AMT tweeter in a sold walnut enclosure signed Dr. Oskar Heil and 5 or 6 pages of handwritten notes on crossover design that he fixed her up with. I met her originally to set up distributed audio for her. When that was done she showed me a single AMT1 with a trashed woofer. Asked me to build her another speaker and fix that one. I explained gently to her that I would need another AMT and that building another enclosure might be tough. She took me out to her garage and handed me the other AMT, the notes and the Signed AMT and said, will this help? I was blown away. I got hold of a pair of enclosures which were empty and bought some Dayton tens that looked like they might like the enclosure and match up with the AMTs. After messing around with the crossover for a while, I got them sounding ok. Took them over to her house and set them up. I had some other work to do so left them to play. I went back to shut them off and couldn't beleive the change after they had broken in. I got lucky, they were magnificent. There was a brochure and other paperwork included. If you are interested, I can send pics and scans to you. I am also sending this info to ESS Labs in SoCal. BC

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