Drum Head A electric guitar collection is basically just like an energetic mike coil. For decades, energetic microphones have already been wired with the style coil mounted on the primary of the microphone's transformer, and not recommended to surface (‘floating'). The microphone's case is normally linked to the cable shield, which can be linked to the mike amplifier's ground (see Rane's site for more discussion).
By and big, active microphones are extremely calm devices consequently of the combination of transformer isolation and balanced, suspended sign lines throughout, as well as guarded, humbucking coils.
Therefore why don't you instruments? Instruments are once affected by noise. Humbucking pickups are just a partial (though important!) solution. The obvious alternative is to float practicing the guitar collection to a balanced output, being a microphone. A similar thought was published this 2001 patent software such as Drum Head?