@koestner
I agree that only you will be able to tell if you prefer the sound of the DBX (as a DAC) or your OKTO. I’d try it without the OKTO and perhaps live with that for a few weeks or months.
As I recall, @mijostyn has posted about this in the past and he is a long time user of DSP “preamps” for crossover and bass/room correction. He’s even supporting a very nice turntable with this solution, perhaps he’ll weigh in on this.
I’m still using an analog crossover for subs, however, I am intrigued by the capabilities of digital solutions. And I think they are only going to get better.