Do you have Dynaudio in your car?
Yes, I do.
I realised this a bit late from your previous posts. You seem to have had a problem with the power from the system.
I must admit, the RNS510 does not go as loud or as deep as the RCD310. But I'm happy with it now and can always swap back to my trusted RCD310 which even works with the VW Bluetooth. Ofcourse, there is no voice control.
For sound quality comparisons the RNS510 is MP3 and the RCD310 is CD.