Open Back Guitar Speaker Cabinet A best guitar pickup is basically similar to a dynamic mike coil. For many years, powerful microphones have now been sent with the voice coil mounted on the principal of the microphone's transformer, and not introduced to soil (‘floating'). The microphone's case is normally connected to the cable guard, that is connected to the mike amplifier's ground (see Rane's internet site for more discussion).
By and large, energetic microphones are extremely quiet products as a result of the combination of transformer isolation and balanced, hanging indication lines all through, as well as shielded, humbucking coils.
So why not instruments? Guitars are once plagued by noise. Humbucking pickups are just a partial (though important!) solution. The most obvious answer is to move practicing the guitar collection to a balanced production, as being a microphone. An identical idea was printed this 2001 patent application like this Open Back Guitar Speaker Cabinet?