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I think you have your ohms confused. The type of ohms that involve mics and guitars are Impedance, not resistance. The difference being, impedance is an object's ability to resist an alternating current. Resistance (in ohms) is just for DC (to simplify). So yes, guitars and mics may have the same resistance, but we're talking impedance, which is a whole different beast. (600 sounds about right for a mic, they vary greatly sometimes tho)
PS unless it's wet, I imagine wood would have a far greater resistance than just 600ohms
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