What is Phantom Power?
Phantom power is a method of supplying DC electrical power (typically 48 volts) through an audio cable to power condenser microphones and active DI boxes. It's called "phantom" because the power travels invisibly through the same XLR cable that carries the audio signal, without requiring a separate power connection.
Condenser microphones need phantom power because they contain active electronics that require electricity to operate. Without it, a condenser mic produces no signal at all.
| Microphone Type | Needs Phantom Power? |
|---|---|
| Condenser (large/small diaphragm) | ✅ Yes |
| Dynamic (SM7B, SM58) | ❌ No (but won't damage it) |
| Ribbon | ⚠️ NO! Can damage mic |
| USB microphones | ❌ No (powered via USB) |
Phantom power is supplied by audio interfaces, mixers, and some portable recorders via a button labeled "+48V" or "Phantom."
Why It Matters
Understanding phantom power is crucial when building your podcast setup. If you buy a condenser microphone without an interface that supplies phantom power, your mic simply won't work. Conversely, accidentally sending phantom power to a ribbon microphone can permanently damage it. Knowing which mics need phantom power helps you choose compatible equipment.
How to Use This in Dispatch
Before recording with a condenser mic, enable phantom power on your audio interface (look for a +48V button). Always connect the microphone before turning on phantom power, and turn off phantom power before disconnecting mics to avoid loud pops. If you're using a dynamic mic like the Shure SM7B, phantom power won't affect it either way.