I was reading about the Diesis Roma and they highlight that they are using a coaxial compression driver from 600-20Khz. They claimed, somewhat incorrectly, IMO, that other 2 inch drivers cannot get to 20Khz (ok it is mostly true but a Beyma CP750Ti can get really close) but their's being coaxial can. The thing was that I know BMS is the only game in town for a coaxial compression driver but the driver in the Diesis didn't look like the ones I had seen. That's because, as I found looking at the BMS site, while most of the BMS coax compression drivers are with Nd magnets , they do have one that has a ferrite magnet (4590). Comparing photos, it is clear that the Diesis driver is the ferrite BMS coax. Nearly everyone else wants to use the Nd versions because they have a bit higher output (as if 110db is not enough) and are much lighter weight. However, looking at the data, it seems the ferrite version is smoother ( I still don't like the amount of distortion I see on the higher frequencies of BMS drivers though) and maybe that is why Diesis chose it rather than an Nd driver because they didn't need that sensitivity nor did they care about the weight it seems. Given what I heard from the Roma Triode in Munich, I have to say that this seems to be a damn good driver when implemented as they have done.
Just thought some here might be curious about this discovery...
Just thought some here might be curious about this discovery...