What Is Phantom Power and When Do You Need It?

Phantom power is one of the most confusing terms for new recordists, and it is also one of the easiest to understand once you know the basics. It sends power to a microphone through the same cable that carries the audio. Some microphones need it, and some are damaged by it if it is switched on by mistake.

What it does

Condenser microphones have a small internal circuit that needs power to work. Phantom power supplies that power, usually at 48 volts, down the XLR cable. The microphone then sends its audio back along the same cable. Most condenser microphones need it, and most dynamic microphones do not.

Which microphones need it

Check the microphone’s instructions. Condenser microphones usually need phantom power, and dynamic microphones usually do not. USB microphones have their own power, so they do not use phantom power. Ribbon microphones can be damaged by it, so check before you connect them.

How to use it safely

1. Turn the level down on the interface or the mixer.
2. Connect the microphone and the cables.
3. Switch phantom power on only if the microphone needs it, and check its instructions.
4. Raise the level slowly, and listen before you record.

Common mistakes

Switching phantom power on or off while a microphone is connected to a live channel can cause a loud pop, which can damage speakers and headphones. Do not switch it with the level high. Turn the monitoring down first, then make the change.

Limits

Phantom power is safe for most modern condenser microphones, but some older or specialist microphones are not. If you are unsure, check the manufacturer’s guidance, and ask a knowledgeable person before you connect anything.

Frequently asked questions

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