Air Motion Transformers are a special type of high-frequency speaker systems developed by the German physicist Oskar Heil during his research on the characteristics of human hearing. The main feature is a unique folding of the membrane film and its accordion-like oscillation when a sound signal is applied. This folding allows for a very large membrane area to be accommodated in a compact space. AMTs are characterized by a very dynamic sound image, excellent impulse response, high efficiency, and low harmonic distortion. For the AIRMT-130, two STL files for 3D printing wave guides are available.

High-End Air Motion Transformer Tweeter, 20 W, 4 Ω

• Tweeter based on the Air Motion Transformer principle
• High-performance neodymium magnet system
• Brilliant, dynamic, and finely detailed high-frequency reproduction
• Folded membrane made of Kapton and aluminum
• High efficiency
• Usable from 2500 Hz
• Stable aluminum front plate

Klang+Ton 08,09/2016: "A compact AMT that can be coupled quite deeply for high-quality two-way and multi-way speakers.".