@styleman I would assume that the Swiss, German, Spanish and Scandinavian companies do the same.
Bang & Olufsen use Scanspeak drivers probably exclusively. Not a bad thing. Scanspeak is one of a handful of companies in the world specially equipped to make beryllium tweeters.
I was once informed that Burmester sources it's AMTs from Elac and I know they also use Mundorf. Definitely not a bad thing. They also use Scanspeaks mid-range drivers for sure, and probably woofers as well. Very few speaker manufacturers in the world make all their own drivers. That said, usually outsourced drivers are heavily modified to bespoke specifications.