Mundorf AMT26-Myro-V2

Description

Special AMT, which was developed in cooperation with Michael Weidlich (Fa. Myro) exclusively for the Myro Time 2 and is only used there. The application range is somewhat higher (crossover frequency from about 4 kHz) and the geometry of the folds is optimized for the reproduction of high frequency signals.
It was necessary to extend the transmission range compared to the Myro Ocean with the AMT 2540. The Time 2 should have a flatter course at the transmission ends to optimize the signal / time response. So a new Mundorf Air Motion Transformer was specially developed.
The AMT has a very linear frequency response with a flat, wide rolloff at the upper transmission end. Usually AMTs show diaphragm resonances at the upper end and a steep drop in sound pressure level afterwards. This is not the case with the AMT from the TIME. The wave geometry of the diaphragm is suitable for high frequencies and due to the very effective damping of the diaphragm resonances the distortion could be reduced significantly.

How does an AMT work ?

Acoustically, an Air Motion Transformer is a parallel circuit of several, very small radiating surfaces (diaphragm pockets / folds). Each pocket (fold) is such a partial surface. Perfect matching (radiation impedance) to the air is only achieved with such a small partial area in the super high frequency range. The interconnection of many partial surfaces improves the matching to about the same degree as we experience with sound lines or even the bafflestep of an enclosure. Put simply, the pocket geometry determines the upper cutoff frequency of the AMT and the total area determines the radiation resistance. The pocket geometry also affects the high-pass response and resonance of the diaphragm. In addition, because of their relatively linear impedance frequency response, AMTs do not exhibit a linear phase frequency response, but rather a leading phase response corresponding to their high pass.
Air Motion Transformers are usually rather super tweeters with a very flat high pass (resonance damped and corrected), very high power handling and sound pressure level. Another advantage, especially with symmetrical driver arrangement, is the "adjustable" dispersion behaviour with the help of the membrane geometry. A long (high) narrow AMT focuses vertically more strongly and radiates horizontally broadly. A short, wide AMT focuses more horizontally and radiates further vertically.

Pictures

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  Mundorf AMT 26 Myro V2

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  Myro Time 2

Measurements

Measuring range: 400 - 50,000 Hz

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  Frequency response

There is a clear resonance point of the diaphragm in the range around 2 kHz that can be corrected very well, as well as the flat low pass that is pulled up far. It should be noted that the AMT was designed for a relatively high coupling to two Accuton C50-8-043 Midrange domes]] was designed.
Since AMTs are extremely sensitive to the construction of the rear chamber and especially to the damping materials within, many materials, cuts and series of measurements were required to achieve the response shown above.

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