Rackmount Guitar Preamp A best guitar pickup is essentially just like a dynamic mike coil. For many years, energetic microphones have been wired with the voice coil attached to the primary of the microphone's transformer, and maybe not referenced to ground (‘floating'). The microphone's situation is usually connected to the cable shield, which is linked to the microphone amplifier's surface (see Rane's site for more discussion).
By and big, active microphones are very calm devices consequently of the mix of transformer solitude and balanced, flying transmission lines all through, in addition to shielded, humbucking coils.
So why not guitars? Guitars are notoriously plagued by noise. Humbucking pickups are merely a partial (though important!) solution. The obvious alternative is to float practicing the guitar collection to a healthy production, being a microphone. A similar thought was published that 2001 patent application like this Rackmount Guitar Preamp?