Apologies for getting a little off topic here, but regarding advances in speaker diaphragm materials, you may have seen the intro of the Yamaha NS-5000s at the Fall 2016 Tokyo Int'l Audio Show. All three drivers (tweeter, midrange, and base) feature Zylon diaphragms at a somewhat affordable price level.
Yes, I've seen those, but didn't have the time to listen to them just yet.