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[Zapitgood]

Ok this might not be easy for some of you to do but I would like to do an experiment. I have be intrigued by the Tao's hum and other hum reports, never having heard myself.

If you can get a hold of an audio oscillator or even a good high quality sound card with decent low end bass, try creating the same frequency hum. There are several free sound applications on the web.

Hitting the exact frequency might either amplify (hmm could that be bad) or reduce the sound (out of phase cancellation). Also, once you think you hit the correct frequency, try deviating a few hertz in either direction, you should (if this is a true audible sound) hear several beat frequencies.

This might shed light on if this is imagined (no disrespect but it IS possible) or an actual sound.

Have not tried this one but here is a start:
http://www.softpedia.com/get/Multimedia/Audio/Audio-Mixers-Synthesizers/SweepGen.shtml

[Bill Beaty]

This was tried back in the 1990s when the Hum first appeared.  Unfortunately the sound appears to contain FM or phase modulation, so beats aren't heard.   But tone-matching gave a frequency of roughly 72Hz if I recall (for tests run in the Taos area by the University of NM.)