No audio output DDJ-800 / Rekordbox / MAC

I've tried what feels like everything and now I'm at a loose end.

I've installed the latest firmware.

I've installed the necessary driver.

My MAC runs on macOS Catalina 10.15.5 so I've had to allow the system software as it was originally blocked.

Speakers are KRKs with RCA connection.

I've uninstalled and reinstalled the drivers multiple times with restarting my mac again and again but still no audio output through my speakers or my headphones even though the DDJ is showing it has the audio playing on the turntable screen. 

I have no idea what to do next can, all suggestions welcome.