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Granite audio ground zero

So with my Jolida integrated used as power amp, I get a fair bit of buzz over the speakers.
Everyone is quick to say it must be a ground loop, even though the buzz is present without any other components hooked up.
So, I tried the ground zero, which is a nice product, that allows you to "match" and tie together all the ground potentials of all gear.
It did squat. Not even a change in "pitch" of the buzz/hiss at any of the 27 possible settings, which the instructions claim should happen.

Seems to me, that with all the chassis grounds still hooked up in 3rd prong of all the power cables, the effect of the ground zero would be bypassed?
Maybe all the third prongs need to be disconnected?
the instructions don't allude to this however.

Anyone else tried this ground zero box?

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Topic - Granite audio ground zero - jhrlrd 21:01:25 08/26/16 (17)
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