I use DSP forward of my DAC and analog active XO and I am quite pleased with result and would not go back. Not an easy task to get the crossover points right. With an understanding of your speakers XO, and the tools of Room EQ Wizard and a cheezy digital active crossover (behringer makes one) you can determine crossover frequencies and slopes. From there one can replace the digital XO with a proper analog XO. It does complicate the system with 6 to 8 channels of amplificaiton, but well worth the effort and expense IMO.