Alesis Multimix 4 Usb A guitar pickup is essentially just like a vibrant microphone coil. For decades, active microphones have now been wired with the voice coil mounted on the principal of the microphone's transformer, and not introduced to ground (‘floating'). The microphone's case is usually linked to the wire shield, which can be attached to the microphone amplifier's ground (see Rane's web site for more discussion).
By and big, active microphones are extremely quiet devices consequently of the mixture of transformer solitude and balanced, flying transmission lines throughout, along with shielded, humbucking coils.
So why don't you guitars? Instruments are notoriously overwhelmed by noise. Humbucking pickups are only a partial (though essential!) solution. The most obvious answer is always to move your guitar collection to a healthy productivity, being a microphone. An identical strategy was printed that 2001 patent application like this Alesis Multimix 4 Usb?