AC511 Soundbar output level to high

I recently bought a Dell AC511 USB Soundbar. It was easy to set up work, works nicely. Looks good.

But... I think the output level is much to high. I always have it between 8 and 12. 14 and higher is to loud.

Most audio drivers have a level setting that can be used to tune the output level. For the AC511 driver, the level setting is equal to the main audio level of the PC, so changing the volume of the PC changes the level in the driver... 

I also notice that the volume is not scaling. It would be nicer if the lower level more fine grained, make the higer levels use bigger steps. (logarithmic?)

I'm using Windows 10 Home.