Mackie 24 8 A guitar pickup is actually just like a vibrant mike coil. For decades, energetic microphones have already been sent with the voice coil mounted on the primary of the microphone's transformer, and perhaps not referenced to floor (‘floating'). The microphone's case is normally attached to the cable guard, that is attached to the microphone amplifier's ground (see Rane's website for more discussion).
By and big, dynamic microphones are very quiet units as a result of the mixture of transformer isolation and balanced, hanging indication lines throughout, as well as protected, humbucking coils.
Therefore why not instruments? Instruments are notoriously overwhelmed by noise. Humbucking pickups are just an incomplete (though important!) solution. The obvious alternative would be to float your guitar pickup to a healthy productivity, being a microphone. A similar thought was published this 2001 patent application such as Mackie 24 8?