Do All Acoustic Guitar Cases Fit A electric guitar pickup is actually just like an energetic mike coil. For decades, powerful microphones have now been wired with the voice coil attached with the primary of the microphone's transformer, and not recommended to soil (‘floating'). The microphone's situation is typically attached to the wire shield, that will be linked to the microphone amplifier's surface (see Rane's site for more discussion).
By and large, active microphones are extremely quiet devices consequently of the mix of transformer isolation and balanced, floating sign lines all through, as well as protected, humbucking coils.
Therefore why not instruments? Guitars are notoriously overwhelmed by noise. Humbucking pickups are just a partial (though crucial!) solution. The obvious answer would be to float practicing the guitar pickup to a balanced result, just like a microphone. The same thought was printed this 2001 patent request like this Do All Acoustic Guitar Cases Fit?