I own and use both in my current setup. Running into some major integration issues myself across my three subs. I normally use the SVS first then tweak with the Minidsp. The crappy thing about the SVS is not sure what level of smoothing they use on their graphs but I have measured before+after with a UMIK and have found the SVS to be overly aggressive on EQ cuts. No problems so far with EQ boost but the cuts can be a little over the top. The other thing I am busy testing is the reported distances that the SVS give do not appear to be the ideal AVR 'delay/distance' to integrate with the mains. In the end I still suggest you use both. Have the SVS do it's thing to try and get a 'flat' response and then tweak using the 2x4 DSP. You only have about 5 PEQ settings and depending on your room it might not be enough. I generally measure with the UMIK the same positions as with the SVS and EQ based on the REW average.