Power Amplifier Class D A guitar collection is actually much like a powerful mike coil. For decades, energetic microphones have been wired with the style coil attached with the principal of the microphone's transformer, and perhaps not recommended to surface (‘floating'). The microphone's event is normally connected to the wire guard, that will be connected to the mike amplifier's floor (see Rane's web site for more discussion).
By and large, powerful microphones are extremely quiet units consequently of the combination of transformer solitude and balanced, suspended sign lines throughout, in addition to shielded, humbucking coils.
So why not guitars? Instruments are notoriously plagued by noise. Humbucking pickups are just a partial (though important!) solution. Well-known alternative would be to move practicing the guitar pickup to a healthy production, as being a microphone. A similar strategy was printed that 2001 patent application such as Power Amplifier Class D?