Lots of speaker manufacturers make a big deal about their driver materials (see: Focal's flax and glass sandwich cones, various aramid woofers, silk vs metal tweeters (and within that aluminum, titanium, magnesium, and of course beryllium), and so on) and ribbon tweeters. What I'm curious about is this: how much does the material actually matter to performance? Is there actually any serious advantage to any of the more advanced materials for mid/bass drivers over simple doped paper? And for HF drivers, is there really much of a (dis)advantage for various metal designs or ribbons vs doped silk/fabric?