Yamaha Electric Keyboard A electric guitar collection is actually much like a dynamic mike coil. For decades, vibrant microphones have now been sent with the voice coil attached with the principal of the microphone's transformer, and maybe not referenced to soil (‘floating'). The microphone's case is typically attached to the wire shield, which is attached to the mike amplifier's soil (see Rane's internet site for more discussion).
By and big, dynamic microphones are very quiet products consequently of the combination of transformer isolation and healthy, suspended transmission lines during, in addition to protected, humbucking coils.
So why not guitars? Guitars are notoriously affected by noise. Humbucking pickups are only a partial (though important!) solution. Well-known answer is to move the guitar collection to a balanced production, being a microphone. An identical idea was printed that 2001 patent request like this Yamaha Electric Keyboard?