Air Motion Transformer
He also invented the "air-motion transformer" audio speaker technology made famous by the amt1 speaker of ESS in the early 1970s.
The amt diaphragm is made of a mylar ribbon, bonded with conductive aluminum strips. It is equivalent in surface area to a conventional seven-inch cone type mid-range driver, but is accordion-folded down to a compact one and a half inch grouping for point-source dispersion. The low-mass diaphragm is suspended within a dipole magnetic field concentrating an intense field around said diaphragm. When signal current passes through the aluminum strips, the ensuing bellows-like motion of the folded pleats moves air five times faster than with a conventional cone driver. This rapid acceleration of air-motion is claimed to provide enhanced sound reproduction, including high dynamic range and over a broad frequency range.
Read more about this topic: Oskar Heil
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