Difference between revisions of "AMT Loudspeaker Chassis"

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

Latest revision as of 16:15, 2 October 2015

The AMT (Air Motion Transformer) is a development of the German physicist Dr. Oskar Heil. It is a tweeter-midrange driver that is low in distortion and has a high efficiency. Depending on the model, the frequency range starts at about 750Hz and goes up to 32000Hz (-6dB). The high efficiency is achieved by a concertina-like membrane, which is excited in a strong magnetic field to vibrate.

The AMT was marketed on a large scale by the US company ESS, but had quality problems and is hardly used today.

ESS company[edit]

Fun Facts: - Efficiency (98-100dB) - DC resistance 3.2 Ohm - resonance frequency 950 Hz - nominal impedance 4 Ohm - use only from 1000 Hz - high impulse speed - sometimes difficult configuration with bass drivers due to high AMT efficiency - the slight increase in high frequencies is often attenuated by blocking circuits

models: AMT 1 AMT 2

Diaphragm: - Kapton plastic - concertina folding - Connections (non-binding, different assignments possible):

(+) Pole: Green / Yellow / Blue
(-) Pole: Black / Violet / Brown / Red

- correct polarity can be determined by noise, if polarity is correct the level is higher

Mundorf company[edit]

Alternatively, the German company Mundorf offers a range of very high quality models.

Application[edit]

The AMT from ESS was used e.g. in these models:

AMT models from Mundorf are used here, for example:

weblink[edit]