Grounding with a Earth box?

@OP,
I have auditioned grounding units, though not the one you reference.
I listened to the CAD ground control at Audioconnection, and both I and ctsooner noticed a significant change in the background. It just seemed 'blacker', and you could make out subtle details in the music that you didn't notice without the CAD.
I, for one, don't put a lot of faith/money on these things, but I have to believe my ears when they do make a change for the better.
Bob

@cakyol,
Incorrect.
Ground lifting and grounding boxes are two different things.

Though I am not versed as to how the other manufacturers connect their equipment, I do know that the CAD unit uses an unused input to connect to the grounding box. This essentially grounds the equipment's circuit, not just the chassis.
B