The DSPeaker Dual Core looks really interesting. The Zu Def MKIIs have 4 subs on the back of them and on each speaker you can adjust Volume, Low-pass Filter, PEQ Gain, PEQ Frequency, Phase. I'm wondering if I can achieve the same effect with these controls without the DSPeaker.
Yes I am looking for USB only but I've found pretty big differences between different USB solutions even in the ~$2000 price range. Most recently I've compared the Calyx 24/192 to the PS Audio DAC. Both are great units but the sound from the PS Audio DAC was far more smooth, transparent and less digital sounding. The problem is there are so many different USB DACs these days with a wide price range, it's hard to narrow down what makes sense.
Ultimately I think I want to improve the transparency and digital sound of my system. It's not bad by any means but I know it can be better. When I listen to live recordings I want get as close to the cliche of making the speakers disappear.