Yamaha Monitor Speakers A guitar collection is basically much like an energetic mike coil. For many years, active microphones have now been wired with the voice coil attached with the primary of the microphone's transformer, and not introduced to soil (‘floating'). The microphone's situation is usually attached to the wire guard, which can be connected to the mike amplifier's soil (see Rane's internet site for more discussion).
By and big, active microphones are very calm units consequently of the mix of transformer isolation and healthy, hanging transmission lines all through, as well as guarded, humbucking coils.
Therefore why not instruments? Instruments are notoriously plagued by noise. Humbucking pickups are just an incomplete (though important!) solution. Well-known option is to float your guitar pickup to a healthy result, as being a microphone. The same thought was printed this 2001 patent application like this Yamaha Monitor Speakers?