Quote Originally Posted by technobear View Post
Quite a few driver manufacturers still make cones that decouple with rising frequency.

The Biflex is an extreme example. Others use pleated cones.

The movement of a whizzer cone is usually decoupled from the main cone at higher frequencies so this too is a form of mechanical crossover and is employed to good effect in my Zu's.

One very clever model uses a metal film cone of varying thickness. It's thinner in the middle. As frequency rises, the outer part of the cone progressively stops moving - a sort of continuously variable mechanical crossover. I am of course talking about the Jordan JX92S.

Any other examples?
Struth not someone who actually wants to contribute to the thread, what a surprise!