Two Splash Cymbals A guitar collection is essentially much like a vibrant microphone coil. For decades, vibrant microphones have now been sent with the voice coil attached to the primary of the microphone's transformer, and maybe not recommended to ground (‘floating'). The microphone's case is typically connected to the cable shield, that will be attached to the microphone amplifier's ground (see Rane's web site for more discussion).
By and large, active microphones are extremely calm products consequently of the mix of transformer isolation and balanced, floating indication lines during, in addition to shielded, humbucking coils.
Therefore why don't you guitars? Guitars are notoriously overwhelmed by noise. Humbucking pickups are only a partial (though important!) solution. The most obvious answer is to move your guitar pickup to a balanced output, just like a microphone. The same idea was published this 2001 patent program such as Two Splash Cymbals?