so this earth vibration... is it mechanical, physical? Or is it the earth mag field that is vibrating?
mags
It is the electromagnetic frequency with relation to the north south magnetic poles. The stylus in the groove of a record disc moves back and fourth as you know, this in turn moves a magnet between two coils, so generating an AC current which is then amplified by the electronics to create high voltage and current to drive a speaker. If you design two toroids with gaps of around 10% of the circumference of each, and place them on top of one another. These toroids are just solenoid coils and have no core as such. Form them on two cork formers because they will heat up over time. These solenoids are made in this order, a bifilar, then a trifilar on top of that. 5 solenoids on each toroid, all wound in the same direction and the same overall length. In the end you have two "C" shaped toroids placed one on top of the other. To make it work is how the coils are connected. This picks up the "7.83Hz" turbulence within the gap of the toroids. The frequency being ELF, is open to a wide band of reception, that is kHz or even MHz because we are not dealing with RF as such, this is not a radio receiver but a magnetic receiver. The inter-reaction of two frequencies which sweep changing magnetic fields which run "similar" to "standing waves" but here are MSW (magnetic standing waves), pick up the turbulance and that is amplified. It is a very sensitive "pickup". Magnetic fields produce "current", this is a current amplifier. To amplify voltage as we know, is not a problem, current WAS when in phase together, so DC is the output. Mike PS I have used the 7.83Hz as a reference, it does not have to be that, 7.8125kHz will work as well, what they call the audio magic frequency!! But really you can take a reference frequency as you want with ref: to the size of coils you are using. You see in a stylus you can move a magnet between coils or move the coils between two magnets, it is the speed at which it moves that creates the current 
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