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發表於 2015-8-29 10:08:07
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本帖最後由 CKKeung 於 2015-8-29 10:09 編輯
Dr. Oskar Heil applied for 6 copyrights of his ESS driver design in USA during 1972 - 1979.
5 of these 6 copyrights have expired already.
Therefore, other companies start making air-motion drivers based on Heil concept but with modifications of course :
- Dayton Audio (USA)
- EmotivaPro (USA) under the name Airmotiv
- MartinLogan (USA) under the name Folded Motion Tweeter
- Precide (Switzerland) who calls their version the AVT (Air Velocity Transformer). - Precide uses an AMT driver for their top of the line headphones.
- ELAC (Germany) who calls their version of the transducer JET
- ADAM (Germany), under the name Accelerating Ribbon Technology[4]
- ETON (Germany)
- Beyma (Spain)
- Furuyama Audio Labs - FAL (Japan)
- SoundTouch (China)
- The Tetra (Canada) 606 uses the Mundorf (Germany) Air Motion Transformer. |
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