Stage Lighting Truss A guitar collection is essentially similar to a dynamic microphone coil. For many years, active microphones have already been sent with the style coil mounted on the primary of the microphone's transformer, and perhaps not introduced to floor (‘floating'). The microphone's situation is usually linked to the wire guard, which is connected to the mike amplifier's ground (see Rane's website for more discussion).
By and big, vibrant microphones are very quiet units consequently of the mix of transformer isolation and healthy, floating sign lines for the duration of, in addition to guarded, humbucking coils.
So why not instruments? Instruments are once overwhelmed by noise. Humbucking pickups are only an incomplete (though crucial!) solution. Well-known answer would be to float the guitar pickup to a balanced productivity, being a microphone. A similar thought was published this 2001 patent application such as Stage Lighting Truss?