"William Sommer******"

"Phil Allison"
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 question, which is the stiffness of a fixed
volume of gas.

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


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


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

Had an 15 inch woofer fitted - did it ?


At 16Hz, there was no /audible/ output from the speaker, but everything
loose in the room was rattling.


** Standing waves are a real bitch........


Ever heard his SF6-filled electrostatics?

** Now that was done for an entirely different reason.



..... Phil