Ed Sheeran Signature Guitar A guitar collection is actually just like an energetic microphone coil. For decades, powerful microphones have now been wired with the voice coil attached to the primary of the microphone's transformer, and perhaps not called to ground (‘floating'). The microphone's event is typically connected to the cable shield, that is attached to the microphone amplifier's surface (see Rane's site for more discussion).
By and large, dynamic microphones are very calm devices consequently of the mix of transformer isolation and healthy, flying sign lines all through, as well as guarded, humbucking coils.
Therefore why don't you guitars? Instruments are notoriously plagued by noise. Humbucking pickups are just a partial (though essential!) solution. The obvious alternative would be to float your guitar pickup to a balanced output, being a microphone. The same strategy was published this 2001 patent request such as Ed Sheeran Signature Guitar?