Professional Piano Keyboard A best guitar pickup is essentially much like a powerful mike coil. For decades, active microphones have now been sent with the style coil mounted on the principal of the microphone's transformer, and not referenced to floor (‘floating'). The microphone's situation is usually linked to the cable shield, which will be linked to the microphone amplifier's ground (see Rane's website for more discussion).
By and large, powerful microphones are extremely calm units as a result of the combination of transformer isolation and balanced, suspended transmission lines throughout, as well as shielded, humbucking coils.
So why not instruments? Guitars are once affected by noise. Humbucking pickups are only a partial (though essential!) solution. The most obvious solution would be to move practicing the guitar collection to a balanced output, being a microphone. An identical thought was published that 2001 patent request like this Professional Piano Keyboard?