My speakers are 3,000 $ active speakers from Buchart and my input is an Innuos streamer, so this is a decent setup - and I like it. And yes, they do have a DAC built in.
However, I realised that my Platin Hub that connects the streamer and the speakers via WiSA has been factory preset in such a way that I could not regulate the volume control when the connection was via USB. I could only volume control via optical and RCA. Now I been able to reset the Platin Hub in such a way that it can be used for volume control when connected via USB.
So problem solved. Thanks for the input that after all helped me to find a solution.