Hi,

In message , Don Pearce
writes

Interesting looking device, but I should think about Xmax before
taking the plunge. That cone is barely able to move. Somehow those TS
parameters don't seem to stack up...

I thought the same thing - Vas is over 2000 litres, which seems huge.
But with an Xmax of only 2.3mm, I would think there was a more space
efficient way of shifting air.

--
Regards,
Glenn Booth