As dualasmak already posted, definitely yes. From a PC with appropriate software, or via dedicated DSP. The cheapest device that could do this is a miniDSP nanoDigi2x8B, which is still available but being discontinued. However, its filter options are relatively limited and its output is 4 SPDIF coax -- which isn't very compatible with the Okto's AES inputs. The
MiniDSP DDRC-88D is a good option, if pricey. Lots of power/flexibility in its DSP, noise probably similar to DAC8, and AES outputs. I scanned the manual: the Dirac software & miniDSP software (for x-over) are sperate downloads. Looks like you don't even need the Dirac to run the x-over portion. If running both, I think there'd be a way to disengage the Dirac if desired.
I have a DAC8 FW1.42 sitting on desk, used as a pricey PC/headphone DAC/amp. I'm considering whether to throw another grand down this rabbit hole, to get the DDRC-88D to make the Okto operational with my 4-ways.