Used Music Gear A best guitar collection is actually much like a powerful microphone coil. For many years, active microphones have already been sent with the voice coil attached with the primary of the microphone's transformer, and maybe not called to surface (‘floating'). The microphone's situation is usually attached to the wire shield, that will be linked to the mike amplifier's surface (see Rane's website for more discussion).
By and big, dynamic microphones are very quiet products consequently of the combination of transformer isolation and healthy, suspended transmission lines during, along with shielded, humbucking coils.
Therefore why don't you instruments? Instruments are notoriously overwhelmed by noise. Humbucking pickups are just a partial (though crucial!) solution. The obvious solution is always to move the guitar collection to a balanced production, just like a microphone. A similar strategy was printed this 2001 patent application like this Used Music Gear?