They were one of the only manufacturers of the patented Air Motion Transformer (AMT) speakers designed by Oskar Heil.
Heil is mentioned as the inventor of an early transistor-like device (see also History of the transistor), based on several patents that were issued to him.
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Oskar Heil (20 March 1908, in Langwieden/Rhineland-Palatinate – 15 May 1994) was a German electrical engineer and inventor.
In past decades, ESS of California produced a series of hybrid loudspeakers using such tweeters, along with conventional woofers, referring to them as Heil transducers after their inventor, Oskar Heil.
Oskar Kokoschka | Oskar Schindler | Lee Oskar | Bob Heil | Paul Oskar Kristeller | Oskar Sima | Oskar Pfister Award | Oskar Luts | Oskar Linnros | Oskar Kohnstamm | Oskar Fischinger | Oskar Eustis | Jennifer Heil | Oskar von Miller | Oskar Vogt | Oskar Sosnowski | Oskar Seidlin | Oskar Schlemmer | Oskar Piotrowski | Oskar Homolka | Oskar Heil | Óskar Halldórsson | Oskar Barnack | Viktor Oskar Tilgner | Oskar von Watter | Oskar von Hutier | Oskar von Hindenburg | Oskar Skarsaune | Oskar Schmiedel | Oskar Sala |