Matt Heafy Signature Guitar A guitar pickup is actually much like a powerful microphone coil. For many years, vibrant microphones have already been wired with the style coil attached to the principal of the microphone's transformer, and maybe not called to ground (‘floating'). The microphone's case is normally linked to the cable shield, which is attached to the microphone amplifier's soil (see Rane's site for more discussion).
By and large, dynamic microphones are very quiet devices consequently of the combination of transformer solitude and balanced, suspended sign lines during, along with shielded, humbucking coils.
So why don't you instruments? Guitars are once affected by noise. Humbucking pickups are only a partial (though essential!) solution. Well-known solution is always to float your guitar pickup to a healthy output, as being a microphone. A similar thought was printed that 2001 patent application like this Matt Heafy Signature Guitar?