Ibanez Promethean P3110 A best guitar collection is essentially much like a powerful mike coil. For many years, dynamic microphones have been wired with the voice coil mounted on the principal of the microphone's transformer, and perhaps not introduced to soil (‘floating'). The microphone's event is typically attached to the wire shield, that will be connected to the mike amplifier's soil (see Rane's site for more discussion).
By and big, powerful microphones are very quiet products consequently of the combination of transformer isolation and balanced, suspended sign lines throughout, along with shielded, humbucking coils.
Therefore why don't you instruments? Instruments are notoriously affected by noise. Humbucking pickups are merely a partial (though crucial!) solution. Well-known answer is always to float the guitar collection to a balanced output, being a microphone. An identical strategy was printed that 2001 patent request such as Ibanez Promethean P3110?