All items tagged with Oskar Heil (10)

Patent Review: Air Motion Transformer Passive Radiator for Loudspeaker

January 10, 2024 by James Croft

Patent Review: Air Motion Transformer Passive Radiator for Loudspeaker

In the August 2018 issue of Voice Coil, James Croft combined the review of two important independent patents, having in common the fact that they try to address the shortcomings of the work of Dr. Oskar Heil with his Air Motion Transformer (AMT) woofer system. Following a review of a Tymphany patent, Croft reviewed a related patent for an Air Motion Transformer Passive Radiator, invented by and awarded to Eugene Julius Christensen (Aspen, CO).

Patent Review: Acoustic Transducer Comprising a Plurality of Coaxially Arranged Diaphragms

January 3, 2024 by James Croft

Patent Review: Acoustic Transducer Comprising a Plurality of Coaxially Arranged Diaphragms

This is a review of a design patent, submitted on behalf of Tymphany, trying to address the shortcomings of the work of Dr. Oskar Heil with his Air Motion Transformer (AMT) woofer system. The patent describes an acoustic transducer comprising one or more electromagnetic motors that drive one or more sets of multiple diaphragms to provide acoustically efficient loudspeaker systems in compact dimensions.

Western Electric To Debut 777 rAMT Midrange Driver at High End Munich 2022

May 5, 2022 by Joao Martins

Western Electric To Debut 777 rAMT Midrange Driver at High End Munich 2022

After successfully rebooting tube production in the US with the relaunch of the 300B, and introducing the stunning new 91E Integrated Amplifier, Western Electric has been busy in other areas. Charles Whitener, the entrepreneur and current president and CEO is determined to take Western Electric to a leading market position in home audio and is investing also in new speaker technologies. The first results will be visible at High End Munich 2022 with the presentation of the new 777 rAMT Midrange Driver.

Thin-Film High-Frequency Transducers (Part 1) - The Advantages

October 22, 2020 by Igor Levitsky

Thin-Film High-Frequency Transducers (Part 1) - The Advantages

In its August 2020 edition, Voice Coil featured an article by experienced speaker designer Igor Levitsky, highly recognized in the industry for developing some of the best planar magnetic speaker and headphone drivers for some of the most reputed brands, focusing precisely on this type of technology. It seems clear that we will see more and more headphones and speakers using thin-film drivers, as the industry is now perfecting the use of different types of diaphragms and materials. The August 2020 edition of Voice Coil includes the first part of this article, completed in the September 2020 edition.

HEDD Confirms Air Motion Transformer HEDDphone Launch in 2019

August 5, 2019 by Joao Martins

HEDD Confirms Air Motion Transformer HEDDphone Launch in 2019

A headphone that is based on a real AMT driver, as used in professional studio monitors? The first presentation was at the 2019 High End show in Munich (May 2019), followed by another recent series of demonstrations at the CanJam London 2019 show (July 2019). Now HEDD Audio has announced that, before the end of 2019, the company intends to ship the new HEDDphone – the first full-range headphone design based on HEDD / ADAM founder and speaker veteran Klaus Heinz’ world-known Air Motion Transformer driver.

Double Down: Voice Coil Focuses on Voice Coils for August 2018

July 24, 2018 by audioXpress Staff

Double Down: Voice Coil Focuses on Voice Coils for August 2018

A reinforced dose of everything that makes Voice Coil the Loudspeaker Industry must-read, the August 2018 edition features an updated directory on Voice Coil manufacturers, while James Croft reviews two patents directly inspired by the work of Dr. Oskar Heil on an Air Motion Transformer (AMT) woofer system. Finally, Vance Dickason characterizes three drivers in Test Bench, including the new Eminence Alpha-5-8 5” midbass driver; the TPL75, a compact pro sound AMT from Acustica Beyma; and a new pro sound compression driver from B&C Speakers.

New Transducer Technology from Christensen Audio

October 26, 2016 by Vance Dickason

New Transducer Technology from Christensen Audio

In this article, Vance Dickason highlights a new transducer technology from Christensen Audio, which was recently introduced and has the potential to replace moving-coil driver types in many applications, both in terms of performance and cost. The new technology represents a radical improvement of the basic and well-known Air Motion Transformer (AMT) technology, as originally developed by Dr. Oskar Heil and ESS Labs in the 1970s. This article was originally published in Voice Coil, January 2016.

Creating Leverage in Licensing Negotiations

September 30, 2015 by Eric Kowalski

Creating Leverage in Licensing Negotiations

In audio, many technological advances have resulted from the work of engineers who have successfully licensed their inventions rather than bringing the products to market themselves. This article on business development and strategy examines licensing negotiation tactics from the intellectual property (IP) owner’s perspective.

ADAM Audio Re-launches US-Sales Subsidiary with New Headquarters in Nashville and Appoints New CEO, David Hetrick

July 10, 2015 by audioXpress Staff

ADAM Audio Re-launches US-Sales Subsidiary with New Headquarters in Nashville and Appoints New CEO, David Hetrick

Adam Audio is re-launching its business worldwide. Current ADAM Audio CEO, Ferdinand von Wrede announced from their world headquarters in Berlin that he has appointed industry veteran David Hetrick as the speaker manufacturer’s North American CEO and will re-launch the US-business with a new Nashville, TN headquarters.

Interview with Nelson Pass

March 31, 2015 by Jan Didden

Interview with Nelson Pass

Over the years, some of the best Nelson Pass projects have been featured by Audio Amateur and audioXpress magazines. The A40 power amp article was published in The Audio Amateur, 4/78, and the A75 power amplifier appears in The Audio Amateur 4/92 and 1/93. His other works are posted at passdiy.com. Originally published by audioXpress on May 2010.