Drum Machine Metronome A best guitar pickup is actually much like a powerful mike coil. For decades, active microphones have been wired with the voice coil mounted on the principal of the microphone's transformer, and not recommended to ground (‘floating'). The microphone's situation is typically linked to the wire guard, that will be attached to the microphone amplifier's soil (see Rane's site for more discussion).
By and big, powerful microphones are extremely quiet units consequently of the combination of transformer solitude and balanced, flying sign lines for the duration of, along with shielded, humbucking coils.
Therefore why not guitars? Guitars are once overwhelmed by noise. Humbucking pickups are merely a partial (though crucial!) solution. The obvious option would be to move the guitar pickup to a balanced production, just like a microphone. The same idea was published this 2001 patent request such as Drum Machine Metronome?