I do not know for sure. You have to take that up with Martin Logan but what you showed me indicates that it can be done.
If you go with subs the MiniDSP and Dirac would be the ultimate set up. Either the plain SHD or the Studio will replace your preamp. If you go with the studio you will need another M1 or perhaps one less expensive one like a Benchmark for the subs and use the M1 on your Martin Logans. The Studio setup will be superior to a regular SHD. Dirac Live and the subwoofers will blow your mind. You will never think of an analog preamp again.
That is the correct model.