Oscar Schmidt By Washburn Acoustic Guitar A guitar collection is essentially just like a vibrant mike coil. For many years, dynamic microphones have been wired with the style coil attached to the primary of the microphone's transformer, and perhaps not recommended to soil (‘floating'). The microphone's situation is usually connected to the cable guard, which can be connected to the mike amplifier's floor (see Rane's internet site for more discussion).
By and big, vibrant microphones are very quiet units consequently of the mixture of transformer isolation and balanced, suspended sign lines during, as well as protected, humbucking coils.
So why don't you instruments? Instruments are once plagued by noise. Humbucking pickups are only a partial (though important!) solution. The most obvious solution would be to move your guitar collection to a balanced production, being a microphone. The same thought was printed this 2001 patent program like this Oscar Schmidt By Washburn Acoustic Guitar?