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cv wrote:

Or build your own outer magnetic circuit as you are saying, retaining the S2 diaphragm, phase plug, pole pieces and throat....

If you read the thread form beginning then you will see that it was my original ultimate intention: to but own magnetic system with S2 diaphragm, phase plug, pole pieces but shortening the S2 driver, making his inner rate 450Hz-500Hz instead of 180Hz. The electromagnet is not really my primary objective but juts the way to generate flux more easily. I would probably do not go there if I have in my disposal available custom-shaped alnico or Neodymium magnets. However, it is much harder, not to mention complicated in the R&D stage to deal with permanent magnets. So, I figure that if I have a change to learn about the field-foil and their constitution to sound then why shouldn’t I. The electromagnetic drivers is kind of “Terra Incognito” in audio and very few people who do it, or who done it in past do it, from my point of view, not at the interpretable level of demands. I had two encouragements last year to try the electromagnetics. The Cogent boys and Shindo. The Cogent boys show that it is very simple to make a filed-coil drives, particularly if a very good quality diaphragm, phase plug and pole pieces have exist. The Shindo drivers encouraged me by pissing me off. There is a guy in NY who sells/import Shindo own electromagnetic and Shindo electromagnetic-modified compression drivers. I have very moderate interest in Shindo Company as I am familiar with their murky electronics, entire their cloudy strategic vision of their sound and also I have a few very credible (from my point of view) people who are very much familiar with the unfortunate (form their point of view) results the Shindo electromagnetic driver achieve. I do not have my own Shindo drivers and never personally heard them in context of interpretable installation. Last year I discover a local guy, here in Boston, with Shindo electromagnetic and I thought to families myself with the results. The guy was very reasonable and welcoming but here is what the mentality of an audio industry whore took over. The US Shindo distributor, somehow leant about my interest to hear the Shindo-using installation and demanded that I should almost sight a written affidavit that would incapable me to tell about my experience with the Shindo sound. The very same distributor proclaimed that I am knowledge, honest and no-nonsense listener.  Can you believe! A person who represents a Shindo company is so firmly stay behind the sound that the Shindo accomplish and so comfortable with the installations of his customers that we wiling to silence the no-nonsense listeners after they heard the actual results? It sounded to pathetic to me to continue be interested in whatever Shindo does. I sent the Shindo with their intimidated results to hell and said to myself that they have no worth to indicative about the advantages or disadvantages of the file coil applications… That all kind of make me pissed and I figured out that I might need to get my own results…

Rgs,
Romy the Cat

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