Phantom power – explanation, function & use

48 volts via the XLR cable, without a separate power line – that's the principle of phantom power. Condenser microphones need this external supply voltage to operate their capsule; audio interfaces, mixing consoles, and preamplifiers provide it via a dedicated 48V switch.

What is phantom power?

A Phantom Power This is a technique that powers a condenser microphone via the microphone cable. No additional cables are needed. The required voltage is usually... 48 volt runs via the XLR connection, which also transmits the audio signal.

The term "phantom" describes the fact that the power supply for the microphone remains "invisible"—that is, without a separate cable. This keeps the wiring simple and tidy. Condenser microphones They need this external power source to operate their microphone capsule. Measurement Microphone works on the same principle.

Advantages:

  • No additional power supplies or batteries required
  • Compatible with standard audio connections (XLR)

For dynamic microphones, the power supply is generally harmless. ribbon microphones However, caution is advised: the voltage can damage them. You can find more information about the microphones they require in the [link/section/document]. Wikipedia article on condenser microphones.

Large-diaphragm condenser microphone in a professional recording room with warm spotlight and reflections on the chrome housing.

Where is the phantom power connected?

You activate the phantom power supply at Audio interface, mixer or preamp, to which your microphone is connected. These devices have a dedicated switch for this, often labeled "48V". When switched on, they send 48 volts via the XLR cable to the microphone.

The correct order is also important: First, check whether your microphone even requires phantom power. Only then should you switch it on. This will prevent damage to microphones that aren't designed for it. Our article on [topic missing] explains the role of the signal chain in recording. AD/DA converter.

Yes, for passive ribbon microphones – the voltage can damage them, so never activate them. Active ribbon microphones are usually protected; if in doubt, consult the manual.

Dynamic microphones can safely ignore voltage. However, you should switch them off when plugging and unplugging them to avoid crackling noises and voltage spikes.

P48 (48 volts via XLR) powers condenser microphones. Plug-in power (3–5 volts via jack) is something completely different and is used for small electret microphones, such as those on cameras or field recorders.

No. It needs a balanced XLR connection. The power supply voltage is not transmitted correctly via an unbalanced jack connector.