Vox Bass Headphone Amp A electric guitar collection is essentially just like a dynamic mike coil. For decades, powerful microphones have now been sent with the voice coil attached with the primary of the microphone's transformer, and perhaps not introduced to surface (‘floating'). The microphone's event is typically connected to the cable guard, which is connected to the microphone amplifier's surface (see Rane's internet site for more discussion).
By and big, active microphones are very calm units consequently of the mix of transformer isolation and balanced, hanging transmission lines all through, along with guarded, humbucking coils.
Therefore why don't you guitars? Guitars are notoriously plagued by noise. Humbucking pickups are only an incomplete (though essential!) solution. Well-known answer would be to move the guitar pickup to a balanced output, as being a microphone. A similar idea was printed this 2001 patent application like this Vox Bass Headphone Amp?