Best Studio Microphone A guitar collection is actually much like a powerful microphone coil. For decades, vibrant microphones have been wired with the voice coil attached to the primary of the microphone's transformer, and not recommended to surface (‘floating'). The microphone's situation is usually attached to the wire shield, which will be linked to the mike amplifier's surface (see Rane's site for more discussion).
By and big, active microphones are very quiet units as a result of the mixture of transformer isolation and balanced, hanging transmission lines throughout, as well as guarded, humbucking coils.
So why not guitars? Guitars are notoriously overwhelmed by noise. Humbucking pickups are only an incomplete (though crucial!) solution. Well-known alternative is to float practicing the guitar collection to a balanced output, being a microphone. A similar idea was published that 2001 patent application like this Best Studio Microphone?