They certainly appear to be Heil AMT's, (Air Motion Transformer), and they are considered among the best tweeters/upper midranges in the world. I auditioned them once in a stereo shop in the seventies-it was hard to tell because I didn't think the woofer in the ESS unit was all that great.
Do a search for Heil and you will see that this has been discussed often. There is even a member named AMT-freak!
Here a couple of discussions on the Heil:
http://www.diyaudio.com/forums/showthread.php?threadid=10802&highlight=Heil
http://www.diyaudio.com/forums/showthread.php?s=&threadid=2817&highlight=pass+heil+air+motion
http://www.diyaudio.com/forums/showthread.php?threadid=8031&highlight=Heil
Do a search for Heil and you will see that this has been discussed often. There is even a member named AMT-freak!
Here a couple of discussions on the Heil:
http://www.diyaudio.com/forums/showthread.php?threadid=10802&highlight=Heil
http://www.diyaudio.com/forums/showthread.php?s=&threadid=2817&highlight=pass+heil+air+motion
http://www.diyaudio.com/forums/showthread.php?threadid=8031&highlight=Heil
Lucky you, those are AMT 1, selling at about 1000 € per pair. The European distributor is Audio Int'l in Frankfurt, but I am not sure if they have a web site. www.hifisound.de carry their products also.
Greetings,
Eric
Greetings,
Eric
capslock said:
Someone's making some money... i have a quote for $150 USD each as spares.
These are indeed fine tweeters. ChrisB and i are working on a design using these for a client (pictures are from a developmental stage -- i hope to get pics of finished speaker this week) and previously did a 3-way AMT-1 conversion.
dave
Attachments
Many thanks to you all! 
I did not have any clue who had made this ribbon unit.
The midband in this speaker is a Dynaudio D52, and the bass unit was a Dynaudio 300mm speaker.
The bass was destroyed together with the amp with active x-over.
So we thinking of making a passive x-over, make the box more stiff and mount a new bass driver.... it is a closed box. so it is pretty big!....
when done we could use it as a test speaker for new amp designs!?!?
Dave :
The SPL level you have shown in the graph.. is this true... 100dB?
Many kind regards
Sonny
I did not have any clue who had made this ribbon unit.
The midband in this speaker is a Dynaudio D52, and the bass unit was a Dynaudio 300mm speaker.
The bass was destroyed together with the amp with active x-over.
So we thinking of making a passive x-over, make the box more stiff and mount a new bass driver.... it is a closed box. so it is pretty big!....
when done we could use it as a test speaker for new amp designs!?!?
Dave :
The SPL level you have shown in the graph.. is this true... 100dB?
Many kind regards
Sonny
If the other box is still O.K. and you can check if yoiu like it's sound then you might still get a new Dynaudio driver as spare part.
This depends on availability and also the price is usually higher than before. You will have to return the defective driver to get a new one at all.
Regards
Charles
Thanks for the tip!
We have decided to make a new box, I have taken the old box apart and found out that the box could be a lot better. It is made from 22mm MDF, one layer and there is not taken any action to enhance its stiffnes....
So we are looking for a new driver.. Something like the fostex... light and stiff cone.
We have decided to make a new box, I have taken the old box apart and found out that the box could be a lot better. It is made from 22mm MDF, one layer and there is not taken any action to enhance its stiffnes....
So we are looking for a new driver.. Something like the fostex... light and stiff cone.
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