Flying V Bass Guitars A guitar pickup is basically just like a vibrant microphone coil. For many years, powerful microphones have been sent with the voice coil mounted on the primary of the microphone's transformer, and not recommended to floor (‘floating'). The microphone's case is usually linked to the wire guard, which will be attached to the microphone amplifier's soil (see Rane's web site for more discussion).
By and big, energetic microphones are extremely quiet units consequently of the mixture of transformer isolation and balanced, hanging sign lines throughout, along with protected, humbucking coils.
So why don't you guitars? Instruments are notoriously affected by noise. Humbucking pickups are just a partial (though essential!) solution. The obvious option is always to move the guitar collection to a balanced output, being a microphone. A similar idea was printed that 2001 patent request such as Flying V Bass Guitars?