Focusrite Scarlett 18i20 USB-C Audio/MIDI Interface (3rd Generation) - Manual (Page 21)

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Working with surround sound
Because the Scarlett 18i20 is equipped with ten line outputs, it is ideally suited for use when working
in multichannel sound formats – LCRS, 5.1 surround or 7.1 surround, for example.
In order to route each channel to the correct output you will need to route the DAW outputs to the
Line Outputs in Focusrite Control (e.g. DAW Output 1 > Line Output 1, DAW Output 2 > Line Output
2, etc.).
Windows users:
In Windows, surround sound can only be used in software supporting multichannel ASIO. In most
cases this will be your DAW, and in general, DAWs capable of mixing in surround allow you to set the
speaker mapping up in the DAW’s Audio Output Preferences or I/O Settings page.
Please see the User Manual (or Help files) for your DAW for guidance on setting up the outputs for
surround mixing with the speaker configuration you wish to use.
Mac users:
On Macs, surround sound configuration can be done from all applications that support multichannel
audio (DAWs & regular macOS Applications). To do this, go to: Applications > Utilities >
Audio MIDI Setup > Scarlett 18i20 > Configure Speakers > Configuration > Select the
desired configuration .