Sg 400 Pro A best guitar pickup is actually just like a vibrant microphone coil. For many years, active microphones have already been wired with the style coil attached to the principal of the microphone's transformer, and perhaps not introduced to ground (‘floating'). The microphone's case is typically connected to the cable guard, that will be attached to the mike amplifier's floor (see Rane's site for more discussion).
By and big, energetic microphones are very calm devices consequently of the mixture of transformer solitude and healthy, hanging indication lines throughout, as well as protected, humbucking coils.
Therefore why don't you instruments? Instruments are notoriously affected by noise. Humbucking pickups are only an incomplete (though important!) solution. Well-known answer is to move your guitar collection to a balanced result, being a microphone. An identical idea was printed this 2001 patent request such as Sg 400 Pro?