Small Guitar Like Instrument A guitar collection is essentially much like a powerful microphone coil. For many years, dynamic microphones have been wired with the voice coil attached with the primary of the microphone's transformer, and maybe not recommended to surface (‘floating'). The microphone's situation is typically linked to the wire guard, that will be attached to the mike amplifier's floor (see Rane's internet site for more discussion).
By and big, dynamic microphones are very calm units consequently of the combination of transformer isolation and healthy, floating transmission lines during, in addition to shielded, humbucking coils.
So why not instruments? Instruments are notoriously affected by noise. Humbucking pickups are only an incomplete (though important!) solution. The obvious answer would be to move your guitar collection to a balanced result, being a microphone. The same thought was published this 2001 patent request like this Small Guitar Like Instrument?