DDJ - GRV6 DM50d no audio

Hi 

I bought new AlphaTheta DDJ-GRV6 and cannot set the audio in Rekordbox. 

I have Pioneer speakers DM-50D connected with TRS and stereo mini, but Rekordbox says there is no audio connection. However, I can play other things from the laptop, so the speakers are working.

But in Rekordbox settings when I try to set audio input and output there is no option to choose.