Neumann U87 Microphones A guitar collection is essentially much like a dynamic microphone coil. For many years, energetic microphones have been wired with the voice coil attached to the primary of the microphone's transformer, and not recommended to ground (‘floating'). The microphone's situation is typically linked to the cable shield, which can be linked to the mike amplifier's soil (see Rane's site for more discussion).
By and big, powerful microphones are extremely quiet units consequently of the mixture of transformer isolation and balanced, suspended indication lines during, along with guarded, humbucking coils.
So why don't you instruments? Instruments are once plagued by noise. Humbucking pickups are just a partial (though crucial!) solution. Well-known alternative would be to move your guitar collection to a healthy result, as being a microphone. A similar strategy was printed that 2001 patent request like this Neumann U87 Microphones?