what does 48v phantom power do

What is 48V Phantom Power? Phantom power refers to the power source used by audio devices in order to replicate the effect of microphones. Although the ANSI standard recommends a voltage of between 11 and 52 volts for phantom power, most studios prefer 48 v. When you buy an audio interface, you will usually find a +48v button near the XLR connector inputs. Standalone preamps usually have this button, too, but you rarely need to use one.