Interesting concept...Celestion Peacekeeper: A Revolutionary New Attenuating Speaker for Guitarists

[The~Kid]

I was reading that the person who designed that recently left and went to work for Eminence.
IIRC they are responsible for both speakers in that video.
Cool concept for those in need.

Eminence actually made something similar but better back in the day called the Maverick and ReignMaker one was British style and the other American style but you could control the attenuation like a Master Volume.

Seemed cool but they don't make them anymore.