Shure Wireless Headset Microphone Systems A electric guitar collection is essentially similar to an energetic microphone coil. For many years, dynamic microphones have now been sent with the style coil mounted on the principal of the microphone's transformer, and not referenced to ground (‘floating'). The microphone's event is normally linked to the wire guard, which can be connected to the mike amplifier's ground (see Rane's site for more discussion).
By and big, powerful microphones are very quiet products consequently of the combination of transformer isolation and healthy, suspended transmission lines during, in addition to shielded, humbucking coils.
Therefore why don't you instruments? Guitars are notoriously plagued by noise. Humbucking pickups are merely an incomplete (though essential!) solution. The most obvious answer would be to float practicing the guitar pickup to a balanced result, being a microphone. A similar strategy was printed this 2001 patent application such as Shure Wireless Headset Microphone Systems?