How to record in 5.1?

So I am trying to record with an Avermedia Live Gamer 4k in 5.1. For OBS, I have done a fresh install, and for audio followed the Wiki. The file created by OBS contains 6 channels, but only sound data on the first two channels (i.e. stereo). With RECentral (the Avermedia software), recording 5.1 works. So it must be some setting in OBS that I am missing. But which one?

As can be seen from the log, it shows that OBS apparently recognizes the GC573 as only having two audio channels:

Code:
09:50:48.057:     using video device audio: yes
09:50:48.057:     sample rate: 48000
09:50:48.057:     channels: 2
09:50:48.057:     audio type: Capture

Where can I change this setting and let OBS know that this capture device supports 6 channels?
 
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