Applies to: Scarlett 18i16 4th Gen

The Scarlett 18i16 4th Gen needs at least 5V @ 3A (15W) in order to work correctly. Some, but not all USB-C ports on modern computers will supply this. If you're using a USB-A port, and you haven't got the included power supply connected, the USB icon on the front of the unit flashes red.

The 18i16 may still show up as an audio device in your computer's Sound Settings, however, no audio will go to the 18i16's outputs, and it won't connect to the Focusrite Control 2 software.

Here are some steps you can try if you see this behaviour.

Connect the Scarlett 18i16 to a USB-C port on your computer

If you have a USB-C port on your computer, it may supply enough power to the Scarlett 18i16.

Try a different USB cable

USB cables longer than two metres can sometimes cause issues. Ensure the replacement USB cable is shorter than this. For more information about USB cables, please see here.

Power the Scarlett 18i16 with the included power supply

As well as the main USB port, the Scarlett 18i16 has an extra port on the rear panel, labelled 5V DC, which you can connect the included power supply to if none of the USB ports on your computer supply enough power.

You can find the power supply in your Scarlett 18i16's box.