Yamaha P45 Bundle A guitar pickup is actually much like an energetic microphone coil. For decades, active microphones have been wired with the voice coil attached with the primary of the microphone's transformer, and not recommended to surface (‘floating'). The microphone's event is normally attached to the cable shield, that will be attached to the mike amplifier's floor (see Rane's internet site for more discussion).
By and large, powerful microphones are extremely quiet units as a result of the mix of transformer solitude and balanced, floating transmission lines all through, in addition to guarded, humbucking coils.
So why not guitars? Guitars are notoriously affected by noise. Humbucking pickups are just a partial (though essential!) solution. The most obvious solution is to move your guitar pickup to a healthy output, just like a microphone. An identical idea was published this 2001 patent application such as Yamaha P45 Bundle?