Black Sabbath Tulsa A guitar collection is basically just like a dynamic microphone coil. For many years, energetic microphones have already been wired with the style coil mounted on the primary of the microphone's transformer, and not referenced to ground (‘floating'). The microphone's case is normally linked to the wire shield, which will be connected to the microphone amplifier's ground (see Rane's site for more discussion).
By and big, dynamic microphones are very quiet products consequently of the combination of transformer solitude and healthy, suspended sign lines during, in addition to shielded, humbucking coils.
Therefore why don't you guitars? Instruments are notoriously affected by noise. Humbucking pickups are merely a partial (though crucial!) solution. The obvious alternative would be to float practicing the guitar pickup to a healthy production, being a microphone. The same strategy was printed that 2001 patent request like this Black Sabbath Tulsa?