He might be a fraud or it might be that he did found some stock of “different” Vitavox or Mike’s diaphragm. I do not think that there were any standards and the make different production runs, and some of them might be better or worse than other. Evan the driver themselves – you can find the original driver very 5 different Alnico magnets and with very different Sound. So, who knows – those diaphragms might be:

1)    Fraudulent crap
2)    Fraudulent but not crap
3)    Original but crap
4)    Original but  not crap

What makes me feel that it is very much might not be a fraud and the guys just put a dummy description is the fact that who in the hell would fake the Vitavox diaphragms? There are a 2-3 dozen peoples around the whole world who use Vitavox S2 and perhaps 5%-10% of them would buy new diaphragms. To press the diaphragms is a reasonably sophisticated ceremony, way someone would go into efforts to fake good for 5-10 sales?

In fact if someone can fake the S2 diaphragms then I would like to get in touch with those people and I would willing to work with them, paying them, in order to make together better diaphragms then what Mike or what Vitavox did. I am sure that then they would advertised their diaphragms as “better then original” and it would do more good for them.

cv wrote:

the lead outs look rather fragile.

Actually I recognize it as  a positive feature.

cv wrote:

the material looks like it may not even be aluminium - it kinda looks like titanium ?!

If it is so then even more respect to their manufacturing facility as titanium is more difficult to stamp then aluminum. I would certainly prefer to have aluminum but it does not mean the if people use titanium with respect to the sound that they are getting then they can’t get some interesting results. The key is to learn of the HK guy who stamp the cones have any sonic objectives. 

cv wrote:

… Given the apparent mass difference (I don't have scales that are resolving enough)

You do not have a cartridge scale? Anyhow, I think the key would not be the mass difference but rather to recognize the suspension compliance difference….

Thanks for the offer to let me play with them. I have over dozen diaphragms for S2, a few different types and I am not anxious to experiment with them anymore. I very comfortable with what I have now unless someone credibly state that the HK’s diaphragms are better I would not move. At this point I would let others to do the experiments: I look forward to retire from those games.