FWIW just because an avr advertises ".2" doesn't mean it has two separately adjustable sub channels, often it simply means two identical pre-outs. Some avrs do have separately adjustable subs (for level and delay), like the AudysseyXT32 equipped units from Denon and Marantz for example. Having a minidsp would limit the useful ness of having that second output, but perhaps it could still be useful for something like tactile transducers....