All items tagged with Air Motion Transformer (26)

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.

The Latest in Loudspeaker Knowledge and Developments in Voice Coil October 2023

September 29, 2023 by audioXpress Staff

The Latest in Loudspeaker Knowledge and Developments in Voice Coil October 2023

In the October 2023 issue of Voice Coil, James Croft reviews an active noise control enclosure system, and Mike Klasco and Nora Wong provide an updated directory of Integrated Electronics for Loudspeakers. Vance Dickason offers three different driver characterizations, starting with the AMT100H driver from Eighteen Sound. Next up, he tests an updated version of the popular TW030WA23/24 tweeter from Wavecor. And finally, measures the Scan-Speak D2008/2010, the revised version of the classic dome tweeter from the Danish brand.

HEDD Audio Announces HEDDphone TWO, Lighter and Refined AMT Headphones

September 7, 2023 by Joao Martins

HEDD Audio Announces HEDDphone TWO, Lighter and Refined AMT Headphones

HEDD Audio, the Berlin-based manufacturer of studio monitors and headphones, announced the launch of the successor to the original HEDDphone ONE Air Motion Transformer (AMT) headphones, introduced in 2019. The new HEDDphone TWO are powered by advances in AMT technology and informed by profound user feedback. The company calls it "a turbo-charged evolution." The open-back over-ear driver, headband and strap system were completely redesigned, resulting in a 25% weight reduction of the headphones to 550g in total.

Lyngdorf Audio High-End Cue-100 Speaker Unveiled at ISE 2023

February 10, 2023 by Joao Martins

Lyngdorf Audio High-End Cue-100 Speaker Unveiled at ISE 2023

Lyngdorf Audio launched its all-new high-end audio loudspeaker, the Cue-100. The Lyngdorf Cue-100 is the first loudspeaker from the brand merging modern Danish design with the latest Purifi speaker technology. The benchmark-setting Purifi aluminum drivers are integrated in a uniquely shaped cabinet, finished in satin-black or satin-white with solid oak elements, and available with a selection of five all-around fabric covers by Gabriel from Denmark.

Test Bench: The AMT 23CM1.1-C Air Motion Transformer from Mundorf

July 20, 2022 by Vance Dickason

Test Bench: The AMT 23CM1.1-C Air Motion Transformer from Mundorf

The AMT 23CM1.1-C high-end Air Motion Transformer is the second model from the series launched by Mundorf. Following the explication of the U80W Mundorf AMT, published in the March 2022 issue of Voice Coil, Vance Dickason dives deeper into the series and proprietary diaphragm material used in all the Mundorf AMTs. Features for the Mundorf AMT 23CM1.1-C include a pleated AMT diaphragm, an optimized injection-molded rear chamber and flat round metal face plate, rated for 125W power handling with a minimum second-order 2.2kHz high-pass network. This article was originally published in Voice Coil, April 2022.

Voice Coil Test Bench The U80W Air Motion Transformer from Mundorf

June 16, 2022 by Vance Dickason

Voice Coil Test Bench The U80W Air Motion Transformer from Mundorf

As a respected manufacturer of high-quality condensers and crossover components, Mundorf is also capitalizing on the industry's “renaissance” in AMTs and now offers five models in this updated U series, each driver having the same width, but different heights. The U80W AMT model features a 63mm x 19mm pleated proprietary AMT diaphragm, an optimized rear chamber, a flat face plate with an optional secondary aluminum face plate, and is rated for 80W power handling and 94dB sensitivity. The U Series is the fourth in Mundorf's AMT portfolio. This article was originally published in Voice Coil, March 2022.

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.

Stay on Top of Loudspeaker Industry Developments with Voice Coil April 2022

March 29, 2022 by audioXpress Staff

Stay on Top of Loudspeaker Industry Developments with Voice Coil April 2022

Voice Coil April 2022 is now available and brings an interesting overview of the latest updates to Loudsoft's FINE Suspension Nonlinear FEA Spider and Surround Design software. Mike Klasco discusses Cables, Lead Wires, and Connector/Terminal Technology, and there's an updated directory of vendors and manufacturers in those product segments. Then, Vance Dickason characterizes the AMT 23CM1.1-C Air Motion Transformer from Mundorf, and the Beyma CD1ND 1" Polyimide Diaphragm Compression Driver and TD-194 compact horn.

Steinway Lyngdorf Introduces Steinway & Sons Model A Full-Range Speakers

March 4, 2022 by audioXpress Staff

Steinway Lyngdorf Introduces Steinway & Sons Model A Full-Range Speakers

The new Steinway & Sons Model A is a full-range loudspeaker that was designed by Steinway Lyngdorf to provide the best in sound performance in a room-friendly placement against a wall. This makes the Model A the ultimate luxury audio choice when the room interior demands a more space-saving setup, from living rooms and media rooms to apartments, penthouses, or yachts, and even dedicated home cinemas without the space for separate woofers.

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