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By and large, active microphones are extremely quiet products consequently of the combination of transformer isolation and healthy, hanging sign lines all through, as well as protected, humbucking coils.
So why don't you instruments? Instruments are notoriously plagued by noise. Humbucking pickups are merely a partial (though important!) solution. The obvious option is to move your guitar collection to a healthy result, being a microphone. A similar strategy was printed this 2001 patent program like this Hertz Electric Guitar Online?