Martin Om 18v A electric guitar collection is actually just like an energetic mike coil. For decades, vibrant microphones have already been wired with the style coil mounted on the principal of the microphone's transformer, and perhaps not referenced to surface (‘floating'). The microphone's event is typically connected to the cable shield, which can be attached to the mike amplifier's floor (see Rane's website for more discussion).
By and large, vibrant microphones are extremely quiet units consequently of the mixture of transformer isolation and balanced, floating transmission lines throughout, along with guarded, humbucking coils.
So why not instruments? Guitars are notoriously overwhelmed by noise. Humbucking pickups are just an incomplete (though crucial!) solution. The most obvious solution would be to float practicing the guitar pickup to a balanced production, being a microphone. The same idea was printed this 2001 patent program such as Martin Om 18v?