Power Amplifier Flat Voice A guitar pickup is essentially much like a vibrant microphone coil. For many years, dynamic microphones have now been wired with the style coil attached with the principal of the microphone's transformer, and perhaps not referenced to surface (‘floating'). The microphone's case is typically connected to the wire guard, which can be linked to the microphone amplifier's soil (see Rane's site for more discussion).
By and large, dynamic microphones are extremely quiet products consequently of the mixture of transformer isolation and healthy, floating transmission lines during, in addition to guarded, humbucking coils.
So why not instruments? Guitars are notoriously plagued by noise. Humbucking pickups are just a partial (though important!) solution. Well-known option is to move the guitar collection to a balanced output, being a microphone. An identical strategy was published that 2001 patent software like this Power Amplifier Flat Voice?