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Multi-Way Conventional loudspeakers with crossovers

Why there still no AMT midranges appear?
Why there still no AMT midranges appear?
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Old 10th July 2016, 04:44 PM   #1
mtoc is offline mtoc
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Default Why there still no AMT midranges appear?

The only AMT midrange I found is called Adam audio, otherwise no one wanna produce or design AMT midranges?
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Old 10th July 2016, 05:29 PM   #2
architect is offline architect  Netherlands
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Originally Posted by mtoc View Post
The only AMT midrange I found is called Adam audio, otherwise no one wanna produce or design AMT midranges?
yes it's weird
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Old 10th July 2016, 05:49 PM   #3
eriksquires is offline eriksquires  United States
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Probably physics! Same reason there isn't an ESL subwoofer. I do remember some one selling plans for them in the back of Audio magazine or something, which as I recall were some sort of scam.

Mundorf does have a line of "Pro" AMT's though, which in addition to very high power handling and efficiency (104dB) one goes as low as 900 Hz.

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Old 10th July 2016, 06:04 PM   #4
angeloitacare is offline angeloitacare  Brazil
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Its possible. But as it seems, there is nobody willing to spend development money to make them.

I tried a joint venture with Raymond to develop one, but his ideas became more and more confusing, and since i was not willing to invest without something concrete, he pulled out.

http://www.diyaudio.com/forums/full-...range-amt.html

Last edited by jazbo8; 11th July 2016 at 07:25 AM. Reason: Rule 18
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Old 10th July 2016, 07:05 PM   #5
LineSource is offline LineSource  United States
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Just extending the "clean sounding" crossover frequency down to 1000Hz for a AMT like the Beyma TPL-150 would allow many interesting new designs. Several critical listeners find the TPL-150 sounds strained with a crossover below 1600Hz, despite the excellent SPL measurement data down to 1000Hz.

Spitting large volumes of air through a narrow steel grid by squeezing a pleated diaphragm is not simple to achieve....and may never sound "clean"

Beyma.com website hosts their paper:
"Contributions to the improvement of the response of a Pleated Loudspeaker"
Presented at the 129th Convention 2010 November 47 San Francisco, CA, USA
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Old 10th July 2016, 07:15 PM   #6
mtoc is offline mtoc
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I guess AMT tech is under patent, no one (I mean those big driver makers, we could buy stuff from them to diy) wanna deal with a patentor. Beyma is ribbon.
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Old 10th July 2016, 07:35 PM   #7
Gyuri is offline Gyuri  Hungary
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I had a fortune and pleasure to know Raymond and his speakers.
It seemed to me, he is a very reasonable man with high skills.
https://onedrive.live.com/?id=E894CB...94CB7D50B65FBF
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Old 10th July 2016, 07:37 PM   #8
angeloitacare is offline angeloitacare  Brazil
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Do you have still contact with him ? What is he doing ?
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Old 10th July 2016, 07:38 PM   #9
bwaslo is offline bwaslo  United States
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Why there still no AMT midranges appear?
Didn't Heil have an AMT woofer design at one point? Seems I've seen a photo once...
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Old 10th July 2016, 07:45 PM   #10
Gyuri is offline Gyuri  Hungary
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Quote:
Originally Posted by angeloitacare View Post
Do you have still contact with him ? What is he doing ?
I hope so, he is enjoying his retired life.
No, I haven't contacted with him for years.
Shame on me.
Maybe I can try...
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