What is phantom power commonly used for?

Phantom power is primarily used to power condenser microphones. Unlike dynamic microphones, which generate their own signal using a diaphragm and coil, condenser microphones require an external power source to operate their internal electronics. This power is typically supplied through the microphone cable via phantom power, which can be easily implemented in most professional audio equipment, such as mixing consoles and audio interfaces. By providing a standardized voltage (usually +48 volts), phantom power enables condenser microphones to capture sound with greater sensitivity and fidelity, making it essential for high-quality audio recording in various settings, including film, music production, and broadcasting.

The other options, while related to audio equipment, do not accurately describe the primary purpose of phantom power. For example, while charging batteries is relevant to some microphone types, phantom power does not charge batteries but directly supplies power to the microphone's circuitry.