They are now using a ’polymer’ sub-enclosure in their S5 MK 11 - for the ’critical’ midrange
driver no less.
Isn’t this similar to what Wilson Audio has been using for years?
Curious.
There is a difference between building the entire cabinet from a polymer, a very damp material, not suitable for optimal bass and highs enclosure and drivers coupling, and using it as an internal midrange enclosures, which a polymer damping characteristic is ideal for.