For most modern operating systems like Windows 10, Windows 11, and macOS , the C-1U is a "class-compliant" device. This means the system will automatically recognize it and install the necessary generic USB drivers as soon as you plug it in.
Phantom power is off, or the gain is too low. Fix: Press the +48V switch on your interface. Turn the gain knob to at least 50% (12 o’clock). Speak or sing 4-6 inches from the C1’s side (the Behringer logo is the front). behringer c1 driver