How would you define “phantom power”?

Phantom power is specifically understood as a technique for supplying power to condenser microphones through the same cable that also transmits the audio signal. This method is particularly advantageous because it eliminates the need for additional power supplies or cables, allowing for a cleaner and more efficient setup.

Condenser microphones require a power source to operate their internal electronics, and phantom power provides this in the form of DC voltage—typically 48 volts—delivered via the microphone's XLR cable. The benefit of using phantom power lies not only in the convenience of a single cable for both audio and power but also in maintaining signal integrity and reducing clutter in a microphone setup.

Other choices relate to different power supply methods or equipment but do not correctly define phantom power as it pertains to audio technology.