.....just to add to this. This is from The Hum site................
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More Important Evidence.
A German Hum researcher was recently given access to two insulated
chambers, the first shields acoustic, electrical and magnetic signals.
The EM shielding works excellently for frequencies above 1kHz and
the acoustic shielding is very good at all frequencies.
The second chamber was not built with acoustic shielding but does
block most ambient noise and it shields all magnetic and electrical
fields.
It has the best shielding standards in the world, no chamber has
better data, neither the Earth's magnetic field or any EM is
detectable within this chamber.
These chambers are most probably the quietest places on Earth and
yet the Hum was "heard" in both.
This adds to the mounting evidence that the Hum is neither
acoustic or electromagnetic and therefore must have some other cause.
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