If it’s the Earth’s natural frequency, then that frequency is already in the room. Why would you need to generate it?The S.G. grid amplify it....And his harmonics.... Then adding a form of powerful noise that act to the signals like a dithering factor....
By the way the Schumann frequencies linked to earth are a SET of spectrum peaks more than a single frequency like the Schumann generator....
But my explanation is ONLY a guess...
What i know for sure is that my S.G. grid work in my room....
My best to you with cold mate.....Or hot one.....