Hi Wolfgang,
if you have a lot of SACDs it may probably make sense to get a cheap Pioneer BDP-450 from Ebay as transport, use the Optical to USB converter plus rooPlay and playback via the DAC in your DR-570.
As I told before you will get 24Bit 88.2kHz from this device and ho quality loss at all as anything comes buffered from Roon and will be perfectly played back without Jitter via the DR-570.
For sure this investment only makes sense if you have a lot of SACDs.
I solved my SACD playback issue by ripping the SACDs on a Playstation with “special” firmware that was able to rip SACDs to DSF files. I rent this Playstation from one of my customers. He lives in Frankfurt Germany and maybe he is willing to also rent it to you. If you’re interested in this please mail me at info@definiteaudio.de
Best DrCWO