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Yes, Rulit does try to push envelop of something. He does exiting projects but I do not know how all of it manifests itself in actual results. I said that he  pushes the “envelop of something” as I do not know what this “something” is.  I never heard anything he does. 10 years back what I was traveling in Germany I was planning to visit him, we contacted him; preliminary agreed to meet but when I was there it slipped off my plans (cherchez la femme), so we never met and I never heard anything he does.

When I was talking about ultimate driver I did not really was looking for a brand and model but rather to create a retrial requirement for a hypothetic ultimate driver. Let me to copy what Rulit says as the eBay article will be gone soon:

“For sale are two Atelier Rullit RH-T903 field coil drivers. This pair is actually a result of my research on compression drivers. I have tried out every material I could think of, be it different species of aluminium or phenolic and cellophane for manufacturing diaphragms, but each turned out to be sounding somewhat uncouth, crude and aggressive, in other words PA (public address), and didn't have anything to do with home use. The up-to-date Rullit drivers are equipped with diaphragms from cellulose. They're playing bloody awesome - delicate and with a sensation of "just alike live". The chef's suggestion for music gourmets ... fits absolutely fine in two-way combinations like Klangfilm Eurodyn, Western Electric, etc. Résumé: Apart from rare exceptions, all PA drivers, including the ancient ones, have been developed for other purposes than subtle music reproduction and thus are hardly appropriate for home use. The cellulose diaphragms showed the way to another world, another dimension ...”

For sure the use of cellophane cone is a novelty but my primary concern in this thread is not what people do but what they are trying to accomplish. Among his objective Rulit named that he was searching ways to escape crude and aggressive sound from PA-minded compression drivers. For sure it is a noble task but there are plenty drivers that do not sound crude and aggressive but instead they sound soft and syrupy. So, based upon his description I do not know what he was trying to accomplish. Generally I do not like the “small” 802-size diaphragms like Rulit use. They are a bit too upper HF and do not do well at lower MF. The cellophane diaphragm might behave differently, I just do not know. Still, Rulit does have tendency for use wide bandwidth drivers with minimal amount of channels. This is not the direction that I like and Eurodyn or Western Electric would not help being brought as reference.

Anyhow, if use the Rullit’s input in ultimate compression driver subject then it would be “no crude and aggressive sound.” I am certainly on the same page with him.  However, all of the drivers that I ever seen and heard had the very same characteristics – if they did not sound aggressive then they were not able to show off aggressiveness when music does call aggressive and brutality.  This ability to show off the viciousness and violence if necessary is one of the many characteristics for which I like so much my Vitavox S2 driver. S2 is very much along with Rulit classification of PA drivers and S2 is crude and aggressive. However, if it used properly and sensibly then S2 is very much not aggressive, in fact it is as soft and malleable as baby kitten but if it was called upon to throw aggressive vigor then it has “it” with itself.   BTW, partially it is what my 6E5P amps do.

So, one of my requirement  for an ultimate compression driver would be NOT abolition of crudeness and aggressiveness but rather to ability of a driver to play soft and elastic when necessary and to play hard and bold when music is called upon it.

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