Playing regular DSD files is also quite a bit quieter on the Devialet so it really isn't a problem.
It's Devialet's implementation, they don't apply 6db of recovery gain like software dsd to pcm decoders. As Brian indicates -6db less gain than pcm is in the dsd spec and he also has -3db of headroom to prevent clipping.
So roon DSD upsamling is 3db quieter than regular dsd files because of conversion headroom that's it.
It's Devialet's implementation, they don't apply 6db of recovery gain like software dsd to pcm decoders. As Brian indicates -6db less gain than pcm is in the dsd spec and he also has -3db of headroom to prevent clipping.
So roon DSD upsamling is 3db quieter than regular dsd files because of conversion headroom that's it.
Roon->HQPlayer->McIntosh C47->McIntosh MC301s>Transparent Super->Wilson Audio Sabrinas w/ Shunyata Denali, Rega RP8, Rega Apheta 2