Phantom Power
Definition
A method of supplying electrical power (typically 48V DC) to condenser microphones through the same XLR cable used for the audio signal. Required by most condenser microphones but harmless to most dynamic microphones and passive ribbon mics.
In Simple Terms
48 volts of electricity sent through your microphone cable to power condenser microphones. No phantom power, no sound from a condenser mic. Hit the +48V button on your interface before recording.
In Practice
An engineer engages +48V phantom power on the preamp channel before connecting a condenser microphone to supply the necessary voltage for the microphone's internal electronics.
Common Confusion
Phantom power is generally safe for dynamic microphones but can damage some active ribbon microphones. Always check the microphone's specifications before engaging phantom power.