Esp Ltd Ec 331 A best guitar pickup is basically just like a dynamic mike coil. For many years, active microphones have now been wired with the style coil attached to the principal of the microphone's transformer, and maybe not referenced to ground (‘floating'). The microphone's case is usually connected to the wire shield, which can be connected to the microphone amplifier's ground (see Rane's web site for more discussion).
By and large, active microphones are extremely calm units consequently of the mixture of transformer solitude and balanced, suspended indication lines for the duration of, in addition to guarded, humbucking coils.
So why don't you guitars? Instruments are once plagued by noise. Humbucking pickups are only a partial (though important!) solution. The obvious option would be to move your guitar pickup to a balanced output, just like a microphone. The same idea was printed this 2001 patent request like this Esp Ltd Ec 331?