Electric Guitar Speaker Cabinet A best guitar pickup is essentially similar to a powerful microphone coil. For decades, active microphones have been wired with the voice coil attached to the principal of the microphone's transformer, and maybe not referenced to surface (‘floating'). The microphone's situation is typically connected to the cable shield, that is attached to the microphone amplifier's ground (see Rane's website for more discussion).
By and big, powerful microphones are very quiet devices consequently of the mix of transformer isolation and healthy, suspended indication lines through the duration of, in addition to protected, humbucking coils.
So why don't you instruments? Guitars are once affected by noise. Humbucking pickups are just a partial (though crucial!) solution. The most obvious alternative would be to float the guitar collection to a healthy output, being a microphone. An identical idea was printed this 2001 patent software like this Electric Guitar Speaker Cabinet?