Epiphone 335 Case A guitar collection is basically much like a dynamic microphone coil. For many years, powerful microphones have now been sent with the style coil mounted on the principal of the microphone's transformer, and maybe not recommended to soil (‘floating'). The microphone's event is typically linked to the cable guard, which will be connected to the microphone amplifier's floor (see Rane's website for more discussion).
By and large, active microphones are very quiet units consequently of the mix of transformer isolation and balanced, floating sign lines all through, along with protected, humbucking coils.
Therefore why not guitars? Instruments are notoriously affected by noise. Humbucking pickups are just an incomplete (though important!) solution. Well-known solution would be to float the guitar collection to a balanced production, as being a microphone. A similar thought was published this 2001 patent request like this Epiphone 335 Case?