Two Notes Torpedo Cab A best guitar pickup is actually similar to a powerful microphone coil. For decades, dynamic microphones have been sent with the voice coil attached with the primary of the microphone's transformer, and perhaps not recommended to soil (‘floating'). The microphone's situation is usually linked to the cable shield, that is connected to the microphone amplifier's floor (see Rane's website for more discussion).
By and big, energetic microphones are very quiet units as a result of the mix of transformer isolation and balanced, flying sign lines during, as well as protected, humbucking coils.
Therefore why not instruments? Instruments are notoriously affected by noise. Humbucking pickups are only an incomplete (though important!) solution. Well-known alternative would be to float your guitar collection to a healthy production, just like a microphone. The same idea was published this 2001 patent program such as Two Notes Torpedo Cab?