I'm looking for an inexpensive sound card for a low profile PC (Dell Optiplex 9020) running Windows 10. I'm not looking for anything high end, I just want to be able to drive a pair of powered speakers (Sony SA-S900 - 2 way with an electrostatic tweeter) and a powered subwoofer, without needing a separate preamp or crossover. Ideally I'd like the ability to select a low pass and high pass filter for the sub and satellites, respectively. I'm considering the Xonar DGX - I've already got a Xonar DG in my office (Lenovo) PC driving a pair of Genelec nearfield monitors, and I'm happy with the sound, but the Optiplex doesn't have a PCI card slot, only PCI-e. Will that do what I'm looking for? Alternatively, is there anything else in the same price range that might do the trick? An external USB interface is also an option.