Alesis Dm10 Pro A guitar pickup is essentially much like a vibrant mike coil. For many years, dynamic microphones have been sent with the style coil mounted on the principal of the microphone's transformer, and perhaps not introduced to ground (‘floating'). The microphone's case is typically linked to the wire shield, that is connected to the mike amplifier's floor (see Rane's site for more discussion).
By and big, energetic microphones are extremely quiet devices consequently of the combination of transformer solitude and balanced, suspended sign lines throughout, as well as shielded, humbucking coils.
Therefore why not instruments? Instruments are once plagued by noise. Humbucking pickups are only an incomplete (though essential!) solution. The obvious alternative would be to float your guitar pickup to a healthy output, being a microphone. An identical idea was printed this 2001 patent request like this Alesis Dm10 Pro?