Cordoba Mini M A guitar collection is basically similar to a dynamic mike coil. For decades, energetic microphones have been sent with the voice coil mounted on the primary of the microphone's transformer, and perhaps not introduced to soil (‘floating'). The microphone's event is normally connected to the cable shield, that will be linked to the microphone amplifier's soil (see Rane's site for more discussion).
By and big, powerful microphones are extremely quiet devices consequently of the mix of transformer isolation and balanced, floating indication lines for the duration of, as well as shielded, humbucking coils.
Therefore why not instruments? Guitars are once overwhelmed by noise. Humbucking pickups are only an incomplete (though important!) solution. The obvious alternative is to float the guitar pickup to a healthy output, being a microphone. An identical idea was published that 2001 patent software like this Cordoba Mini M?