Line 6 Amp Spider Iv 15 A guitar collection is essentially similar to a dynamic mike coil. For many years, dynamic 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 event is typically attached to the wire guard, that will be connected to the mike amplifier's floor (see Rane's web site for more discussion).
By and large, active microphones are very quiet units consequently of the mixture of transformer isolation and healthy, suspended indication lines throughout, as well as shielded, humbucking coils.
So why don't you guitars? Instruments are once affected by noise. Humbucking pickups are just an incomplete (though essential!) solution. The obvious option is to float practicing the guitar collection to a balanced output, as being a microphone. An identical thought was printed this 2001 patent program such as Line 6 Amp Spider Iv 15?