I did not have much luck EQing my DS V2 other than bumping up the sub-bass below 40hz. I have not seen any published measurement. I had a friend measure them on his 711 clone and then tried Listener’s DF Tilt technique but I didn’t like it. I also tried just applying a bit of tilt but didn’t hear any improvement. Lastly I tried adding the difference between the DS V1 and DS v2 as measured on his 711 clone to oratory’s preset. I didn’t prefer that either.
If all you need is some more bass punch then I’d play around with adding a PK filter around 60-80hz. Maybe 3db boost with a Q of 2-3.