Phantom power is a small DC voltage – almost always 48 volts – that your audio interface or mixer sends up the XLR cable to power certain microphones. It’s labelled 48V or +48V and toggled with a button.
Which mics need it
Condenser microphones need phantom power to charge their internal circuitry – without it, they produce no usable signal. Most active ribbon mics need it too. If you’ve plugged in a condenser and hear nothing, an un-pressed 48V button is the usual culprit.
Which mics don’t
Dynamic microphones don’t need phantom power and ignore it. So if you only use dynamics, you can leave it off. See condenser vs dynamic microphones for the full difference.
The one warning
Passive ribbon microphones can be damaged by phantom power. If you ever use a vintage or passive ribbon, switch 48V off first and check the manual. For modern condensers and dynamics, phantom power is safe.
How to use it
- Connect the mic with a proper XLR cable before switching 48V on.
- Press the 48V button (global or per-channel on your interface).
- Wait a few seconds for the mic to power up, then set your gain.
New to your interface? Our setup guide shows exactly where the 48V button lives and how to set levels.
Shop related gear
Mics that need phantom power start here:
Detailed, studio-grade condenser for vocals and acoustic instruments — needs 48V phantom power.
