Mesa 2x12 Cabinet A electric guitar pickup is essentially similar to a dynamic microphone coil. For many years, dynamic microphones have now been sent with the voice coil attached to the primary of the microphone's transformer, and maybe not recommended to ground (‘floating'). The microphone's situation is usually connected to the cable shield, that is attached to the microphone amplifier's ground (see Rane's site for more discussion).
By and large, active microphones are very quiet products as a result of the combination of transformer solitude and healthy, flying sign lines throughout, in addition to guarded, humbucking coils.
Therefore why not guitars? Guitars are notoriously plagued by noise. Humbucking pickups are just an incomplete (though essential!) solution. Well-known solution is to float practicing the guitar pickup to a healthy result, being a microphone. The same idea was printed that 2001 patent request like this Mesa 2x12 Cabinet?