Mac doesn't recognize XDJ-RX output

Who can help me please.

I've got a MacBook Pro with MacOS High Sierra.
On the Macbook I have Rekordbox as well as DjayPro (Algorythm).
I have used the Macbook with both programs with a DDJ-RB as well as with 2 CDJ-400. without problems. With the CDJ-400 I used the audio output of the CDJ-s to mij DJM mixer and speakers. All worked fine.

Currently I have upgraded to an XDJ-RX. I Have installed the drivers for de XDJ-RX, but my Macbook doesn't recognize the XDJ-RX as output. I still can choose the DDJ_RB or the CDJ-400, but nog the XDJ_RX. So I have no audio output at all, or only through the speakers of my Macbook. 

Who can help me with this issue?