Synsonics Acoustic Guitar A guitar collection is essentially similar to an energetic microphone coil. For decades, active microphones have been sent with the style coil attached to the primary of the microphone's transformer, and maybe not referenced to floor (‘floating'). The microphone's event is usually connected to the cable shield, which is attached to the microphone amplifier's soil (see Rane's site for more discussion).
By and large, vibrant microphones are very quiet units as a result of the mix of transformer isolation and balanced, floating indication lines for the duration of, in addition to shielded, humbucking coils.
So why don't you instruments? Guitars are notoriously plagued by noise. Humbucking pickups are just an incomplete (though crucial!) solution. Well-known answer is to float the guitar collection to a balanced result, just like a microphone. A similar idea was printed that 2001 patent application such as Synsonics Acoustic Guitar?