Akai Professional Mpk Mini Mk2 A electric guitar pickup is essentially similar to an energetic mike coil. For many years, energetic microphones have been wired with the voice coil mounted on the primary of the microphone's transformer, and perhaps not recommended to ground (‘floating'). The microphone's event is usually linked to the cable shield, which is connected to the mike amplifier's floor (see Rane's site for more discussion).
By and large, active microphones are extremely quiet products consequently of the mixture of transformer isolation and balanced, floating sign lines through the duration of, as well as shielded, humbucking coils.
So why not guitars? Guitars are once overwhelmed by noise. Humbucking pickups are only a partial (though crucial!) solution. The obvious answer is always to float practicing the guitar collection to a healthy production, as being a microphone. The same idea was printed this 2001 patent request such as Akai Professional Mpk Mini Mk2?