Difference between revisions of "AMT Loudspeaker Chassis"
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| − | + | 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.<br /> | |
| − | + | == ESS company == | |
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| − | |||
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| − | + | 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 1 | ||
AMT 2 | 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 == | ||
| + | Alternatively, the German company [[Mundorf]] offers a range of very high quality models. | ||
| + | |||
| + | == Application == | ||
| + | The AMT from ESS was used e.g. in these models: | ||
| + | *ESS [[AMT 1 Tower]] | ||
| + | *[[ESS Connoisseur Series AMT 450]] | ||
| + | *ESS [[PS-81]] | ||
| + | *ESS [[PS-61]] | ||
| + | *[[Myro Concert]] | ||
| + | *[[Myro Grand Concert]] | ||
| + | *[[Myro Concert Monitor]] | ||
| + | *[[Myro Heaven's Gate]] (single speaker with 3 x AMT ''per box'') | ||
| + | *[[Myro Floor Monitor]] | ||
| + | *[[Myro Pro Fidelity 3.1]] | ||
| + | |||
| + | AMT models from [[Mundorf]] are used here, for example: | ||
| + | *[[Myro Whisky]] | ||
| + | *[[Myro Ocean]] | ||
| + | *[[Myro Time 1]] | ||
| + | *[[Myro Time 2]] | ||
| − | + | ==weblink== | |
| + | *[[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:
- ESS AMT 1 Tower
- ESS Connoisseur Series AMT 450
- ESS PS-81
- ESS PS-61
- Myro Concert
- Myro Grand Concert
- Myro Concert Monitor
- Myro Heaven's Gate (single speaker with 3 x AMT per box)
- Myro Floor Monitor
- Myro Pro Fidelity 3.1
AMT models from Mundorf are used here, for example: