Harbinger 15 Inch Powered Speaker A guitar collection is actually much like a dynamic microphone coil. For decades, powerful microphones have already been sent with the style coil attached with the primary of the microphone's transformer, and not introduced to floor (‘floating'). The microphone's case is normally connected to the wire guard, that will be attached to the microphone amplifier's surface (see Rane's website for more discussion).
By and big, vibrant microphones are extremely quiet products as a result of the mix of transformer solitude and healthy, floating indication lines throughout, in addition to guarded, humbucking coils.
So why don't you instruments? Instruments are notoriously plagued by noise. Humbucking pickups are only a partial (though essential!) solution. Well-known option is to move practicing the guitar pickup to a healthy result, just like a microphone. An identical thought was printed this 2001 patent application like this Harbinger 15 Inch Powered Speaker?