Rokit 8 Speaker A electric guitar pickup is essentially much like a dynamic microphone coil. For many years, energetic microphones have been sent with the voice coil attached with the primary of the microphone's transformer, and not recommended to ground (‘floating'). The microphone's case is usually attached to the cable guard, that will be connected to the microphone amplifier's soil (see Rane's web site for more discussion).
By and big, active microphones are very quiet units as a result of the mixture of transformer isolation and balanced, hanging transmission lines for the duration of, in addition to guarded, humbucking coils.
So why not instruments? Guitars are once plagued by noise. Humbucking pickups are merely a partial (though essential!) solution. Well-known answer would be to move practicing the guitar pickup to a balanced productivity, just like a microphone. An identical idea was published this 2001 patent application such as Rokit 8 Speaker?