Best Choir Mics A guitar pickup is actually much like a vibrant microphone coil. For many years, active microphones have now 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 situation is usually connected to the cable guard, that is linked to the mike amplifier's ground (see Rane's site for more discussion).
By and big, powerful microphones are very calm products as a result of the mixture of transformer isolation and healthy, floating transmission lines during, in addition to shielded, humbucking coils.
So why don't you guitars? Instruments are notoriously plagued by noise. Humbucking pickups are just an incomplete (though essential!) solution. The obvious solution would be to float practicing the guitar collection to a healthy result, being a microphone. A similar strategy was printed this 2001 patent program such as Best Choir Mics?