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The AMT (Air Motion Transformer) is a development of the German physicist Dr. Oskar Heil.
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Der AMT (Air Motion Transformer) ist eine Entwicklung des deutschen Physikers Dr. Oskar Heil.
It is a tweeter-midrange driver that is low in distortion and has a high efficiency.
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Es handelt sich um einen Hoch- Mitteltöner der verzerrungsarm ist und einen hohen Wirkungsgrad hat.
Depending on the model, the frequency range starts at about 750Hz and goes up to 32000Hz (-6dB).
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Der Übertragungsbereich beginnt je nach Modell ab ca. 750Hz und geht bis 32000Hz (-6dB).
The high efficiency is achieved by a concertina-like membrane, which is excited in a strong magnetic field to vibrate.
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Der hohe Wirkungsgrad wird durch eine zieharmonikaähnliche Membran erreicht, die in einem starken Magnetfeld zum Schwingen angeregt wird.
  
The AMT was marketed on a large scale by the US company ESS, but had quality problems and is hardly used today.<br />
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Im großen Maßstab vermarktet wurde der AMT von der US Firma ESS, hatte aber Qualitätsprobleme und wird heute kaum noch eingesetzt.<br />
  
== ESS company ==
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== Fa. ESS ==
  
Fun Facts:
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Wissenswertes:
- Efficiency (98-100dB)
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- Wirkungsgrad (98-100dB)
- DC resistance 3.2 Ohm
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- Gleichstromwiderstand 3,2 Ohm
- resonance frequency 950 Hz
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- Resonanzfrequenz 950 Hz
- nominal impedance 4 Ohm
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- Nennimpedanz 4 Ohm
- use only from 1000 Hz
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- Einsatz erst ab 1000 Hz
- high impulse speed
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- hohe Impulsgeschwindigkeit
- sometimes difficult configuration with bass drivers due to high AMT efficiency
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- z.Tl. schwierige Konfiguration mit Tieftonchassis wegen des hohen AMT Wirkungsgrades
- the slight increase in high frequencies is often attenuated by blocking circuits
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- der leichte Höhenanstieg wird oft durch Sperrkreise abgemildert
  
models:
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Modelle:
 
AMT 1
 
AMT 1
 
AMT 2
 
AMT 2
  
Diaphragm:
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Membran:
- Kapton plastic
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- Kunststoff aus Kapton
- concertina folding
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- Ziehharmonika Faltung
- Connections (non-binding, different assignments possible):
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- Anschlüsse (unverbindlich, verschiedene Belegungen möglich):
  (+) Pole: Green / Yellow / Blue
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  (+) Pol: Grün / Gelb / Blau
  (-) Pole: Black / Violet / Brown / Red
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  (-) Pol: Schwarz / Violett / Braun / Rot
  
- correct polarity can be determined by noise, if polarity is correct the level is higher
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- richtige Polung kann durch Mittigkeit von Rauschen festgestellt werden, bei richtiger Polung ist der Pegel höher
  
== Mundorf company ==
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== Fa. Mundorf ==
Alternatively, the German company [[Mundorf]] offers a range of very high quality models.  
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Alternativ bietet die deutsche Firma [[Mundorf]] eine Reihe sehr hochwertiger Modelle an.  
  
== Application ==
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== Anwendung ==
The AMT from ESS was used e.g. in these models:
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Der AMT von ESS fand z.B. in diesen Modellen Anwendung:
 
*ESS [[AMT 1 Tower]]
 
*ESS [[AMT 1 Tower]]
 
*[[ESS Connoisseur Series AMT 450]]
 
*[[ESS Connoisseur Series AMT 450]]
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*[[Myro Grand Concert]]
 
*[[Myro Grand Concert]]
 
*[[Myro Concert Monitor]]
 
*[[Myro Concert Monitor]]
*[[Myro Heaven's Gate]] (single speaker with 3 x AMT ''per box'')
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*[[Myro Heaven's Gate]] (einziger Lautsprecher mit 3 x AMT ''pro Box'')
 
*[[Myro Floor Monitor]]
 
*[[Myro Floor Monitor]]
 
*[[Myro Pro Fidelity 3.1]]
 
*[[Myro Pro Fidelity 3.1]]
  
AMT models from [[Mundorf]] are used here, for example:
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AMT Modelle von [[Mundorf]] werden z.B. hier eingesetzt:
 
*[[Myro Whisky]]
 
*[[Myro Whisky]]
 
*[[Myro Ocean]]
 
*[[Myro Ocean]]
 
*[[Myro Time 1]]
 
*[[Myro Time 1]]
 
*[[Myro Time 2]]
 
*[[Myro Time 2]]
 
==weblink==
 
*[[https://de.wikipedia.org/wiki/Air_Motion_Transformer AMT at German Wikipedia]]<br />
 

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