my latest project is a new PSU for my DAC (Audiolab MDAC), which I'd planned to use a sigma11 for the +15V digital rail and a sigma22 for the +/- 15V analog rails, both totally separate back to the mains (i.e. their own transformers)
I've just discovered that the DAC doesn't isolate the grounds between the digital and analog, so if I follow the above plan, I'm effectively connecting the ground of the two sigmas together. Would this be a problem? If so, would there be a more optimal setup?