New York Guitar School A best guitar pickup is basically just like an energetic microphone coil. For decades, energetic microphones have now been wired with the voice coil attached with the primary of the microphone's transformer, and not referenced to floor (‘floating'). The microphone's case is usually attached to the cable shield, that will be connected to the microphone amplifier's ground (see Rane's site for more discussion).
By and large, vibrant microphones are extremely quiet products as a result of the mix of transformer isolation and balanced, flying transmission lines throughout, along with shielded, humbucking coils.
So why don't you instruments? Guitars are notoriously overwhelmed by noise. Humbucking pickups are merely a partial (though essential!) solution. The obvious answer would be to move your guitar collection to a balanced result, just like a microphone. The same idea was printed that 2001 patent application like this New York Guitar School?