Why 48 volts can sit on a cable a dynamic mic is plugged into and do nothing at all, why a 12-volt scheme that looks similar will kill a microphone outright, and the handling habits that decide whether a capsule lasts two years or twenty.
A condenser microphone cannot work without power. There is a charge to maintain on the capsule and an impedance converter behind it that has to run, and neither happens for free. But a microphone cable has three conductors and all three are already in use — two for the balanced signal and one for the shield. There is no spare wire to send power down.
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