Rammstein American Tour A guitar pickup is essentially just like a dynamic microphone coil. For decades, active microphones have already been wired with the voice coil mounted on the primary of the microphone's transformer, and perhaps not called to surface (‘floating'). The microphone's case is normally linked to the cable guard, which will be connected to the microphone amplifier's ground (see Rane's internet site for more discussion).
By and large, active microphones are very calm devices as a result of the mixture of transformer isolation and balanced, suspended sign lines through the duration of, in addition to shielded, humbucking coils.
So why not instruments? Instruments are notoriously plagued by noise. Humbucking pickups are merely a partial (though important!) solution. The obvious solution would be to move practicing the guitar pickup to a healthy output, just like a microphone. A similar strategy was published this 2001 patent application like this Rammstein American Tour?