Graphene spray and ...

Thanks joeylawn butthat link didn't offer me any idea to explain the statement I read - that Magico 'was putting a layer of graphene' on the driver. Perhaps the comment was in error, a misunderstanding; and Magico is simply adding graphene particles or flakes to the slurry they use fabricating the driver material. That's the common usage.

geoffkait, he meant to say - difficult to make-- so as to be practically useful. And it is.

Huh? No more difficult than, say, making titanium tweeters or applying a one molecule thick 24 carat Gold reflective layer on Gold CDs. 

The problem with graphene is it's basically a 2-dimensional substance, and that's not the most stable state for a substance to be in - it will tend to "curl up" into the more stable 3-dimensional state, unless special methods are used, like stated in the Wikipedia article.

Sort of related, B&W put a coat of diamond on some of their tweeters, I'm guessing using chemical vapor deposition.

Since the Graphene is used as a coating it can be applied as a thin light tape, which would be stable. You can buy Graphene tape all over the Internet, no big deal. Even better DIY.