Tommy Emmanuel Albums A guitar pickup is actually just like a powerful mike coil. For decades, active microphones have been wired with the voice coil mounted on the principal of the microphone's transformer, and not called to ground (‘floating'). The microphone's case is normally connected to the wire guard, which can be attached to the mike amplifier's soil (see Rane's web site for more discussion).
By and big, powerful microphones are very quiet products consequently of the mix of transformer isolation and balanced, floating transmission lines all through, along with shielded, humbucking coils.
So you will want to guitars? Guitars are notoriously plagued by noise. Humbucking pickups are merely an incomplete (though important!) solution. The most obvious option is always to move practicing the guitar collection to a balanced output, as being a microphone. A similar strategy was printed this 2001 patent application such as Tommy Emmanuel Albums?