Midiplus Midi Controller X4 Mini A guitar pickup is basically similar to a dynamic microphone coil. For many years, active microphones have already been wired with the style coil attached with the primary of the microphone's transformer, and not called to floor (‘floating'). The microphone's event is usually attached to the cable guard, which will be attached to the mike amplifier's surface (see Rane's site for more discussion).
By and big, vibrant microphones are extremely quiet units consequently of the mixture of transformer isolation and balanced, flying indication lines for the duration of, along with shielded, humbucking coils.
Therefore why not guitars? Guitars are notoriously affected by noise. Humbucking pickups are just an incomplete (though essential!) solution. Well-known alternative is always to float the guitar pickup to a healthy output, being a microphone. The same idea was printed this 2001 patent program like this Midiplus Midi Controller X4 Mini?