This article is about the use in microphones. For power consumed by appliances while they are off, see Standby power. For other uses, see Phantom Power (disambiguation).
"Phantom voltage" redirects here. For unintentional voltages in power distribution systems, see Stray voltage.
For other schemes to deliver data and power over one cable, see Power over.
A condenser microphone requires power to produce a DC polarizing voltage and to power an internal amplifier required to drive long cablesPhantom power button and indicator light
Phantom power, in the context of professional audio equipment, is DC electric power equally applied to both signal wires in balanced microphone cables, forming a phantom circuit, to operate microphones that contain active electronic circuitry.[1]
It is best known as a convenient power source for condenser microphones, though many active direct boxes also use it. The technique is also used in other applications where power supply and signal communication take place over the same wires.
Phantom power supplies are often built into mixing consoles, microphone preamplifiers and similar equipment. In addition to powering the circuitry of a microphone, traditional condenser microphones also use phantom power for polarizing the microphone's transducer element.
^David Miles Huber, Robert E. Runstein Modern Recording Techniques, Focal Press 2009 ISBN 0-240-81069-4, page 117
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