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el`Ol wrote:

Titanium diaphragm drivers that are completely free of the titanium nastiness (you can believe me, I usually show strong allergic reactions to it) are the Eighteensound drivers with titanium nitride coating. I heard one in the Duevel Sirius.

el`Ol,

again, I think we make a strategic mistake, attributing applying accidental experience as a foundation for some kind of general rules. The Duevel Sirius is VERY different type of speaker where high frequency is being lost a LOT for omni- directivity. Remember in CD horns we need to EQ HF as with conventional drivers juts because the dispersion is unproportionally wide for HF? In case of Duevel Sirius it I not CD directivity but fully omni – it has even more natural HF lost. So, I do feel that for them to use brittle HF driver, or even the drivers with typical titanium resonances at 20K -30K would not be a big deal as they would be severely deferred by HF lost, not to mention that they would dampen but the throat reactance of omni-horn.

I did not use the titanium nitride cones; they might be different from regular titanium domes. From what I have seen I more prefer the titanium domes imbedded into plastic. Saying all of it I would like to note that titanium itself is not a problem. The problems that very seldomly, if ever people design titanium application with respect to sound, they rather design drivers with respect to theories. I am very sure that if people design drivers with respect to sound then no matter what kind materials of diaphragms would be the driver will out the same sound.  It would be different use of the diaphragms but the sound would be the same. We do not have it. We have a driver and we begin to load it with diaphragms of the different materials and we have different sound. So, we attribute that sound to this material. This is wrong as we need to attribute not the material to sound but rather the given application of the material to the sonic results. We do know how for instance identical aluminum and titanium domes behave in the same driver. But we forget to acknowledge that the aluminum can not be unpunishably substituted with titanium in the same driver because if a driver is “made foe sound” then such a change would destroy very fine and very intricate diaphragms/damping/loading balance…

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