"William Sommerwerck"

It's been done. William Michael Watson Dayton-Wright built
conventional dynamic speakers with bags of SF6 in the woofer box.

** For what advantage ?

The speed of sound is about half in SF6 but that is no help in a sealed
box where resonance depends only on the stiffness of the volume of
gas trapped behind the woofer.

The smaller the volume or the larger the woofer, the stiffer it becomes.

The lower speed of sound makes the bag appear to have a larger acoustic
volume than the air it replaces.

** You have simply ignored the question, which is the stiffness of a fixed
volume of gas.

Take a look at Boyle's Law (PV = k)

As Michael Flanders put it...


** You have ignored the question AGAIN !!!!!


I found the spec sheet. He describes the SF6 as performing a linearizing
function.

** Pure marketing hype.


Really. The bass cabinet was about 20" by 20" by 12".

** That is not a "small cabinet" at circa 50 litres internal volume.

I consider it "small",


** Yawnnnnnnnnnnnnnnnnn....

It is not small - a 10 litre box is small.

And Boyle's law makes all the claims re SF6 all wrong.



..... Phil