Abstract
The Air Motion Transformer (AMT), since its invention in the 1970s, has found application as a high-frequency tweeter for loudspeakers. It is perceived as reproducing audio with superior clarity and fidelity of transients compared to moving coil tweeter designs. It is well known that many factors, such as frequency response and properties of nonlinear distortion products, influence human perfect of audio quality. Despite the perceived superiority of AMT performance, few studies have investigated this transducer to accurately model their operation and understand the physical mechanisms that influence their sound quality. This presentation will describe a one-dimensional model for an AMT loudspeaker that can be used to predict both linear and nonlinear behavior of the device. The model will be compared to measured data from commercially available AMT tweeters. Sources of nonlinear distortion in the AMT device that may influence perceived sound quality will be discussed. The similarities and differences between the electroacoustic properties of the AMT and comparable moving coil tweeters, and how these relate to sound quality, will also be discussed.
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