Yes, it is possible with a Lynx AES-16e sound card.
Stereo active speakers. Also, trying to make a surround system with my existing speakers. The BM app with the DDRC-88D is very powerful with the only weak link is the 48khz limitation.
Ditch the DDRC-88D, it is way too expensive for a stereo active system and designed more for individual speaker correction of a multichannel system.
Get a digital Flex and send the stereo Dirac processed output to a SPDIF to USB card mentioned elsewhere in this thread. Use the SPDIF to USB device as the capture device and the DM7 as the playback device on a RPi4 running CamillaDSP. Then implement 2 x 8 routing and x-over / EQ in CamillaDSP on the outputs to the DM7. CamillaDSP is way more powerful and flexible than the DDRC-88D.
Alternatively if you are only using a computer as a source run Dirac on your computer and use a RPi4 running CamillaDSP in gadget mode (although I am sure there are other ways to implement both Dirac and x-overs on a single computer).
If you are set on the DDRC-88D you can use a U-DIO8 as an 8 channel AES or SPDIF to USB capture device as mentioned previously in this thread with a RPi4 running CamillaDSP the captured signal to the DM7 output.
I think part of the problem with the DM7 is requires some out of the box thinking to integrate in to a system but it definitely can be done.
Michael