Here is an interesting demo I did for some folks I know at CAF2017.
I built a block diagram with a 2-way L-R 8-pole crossover using the high precision filters and then summed the output. The L-R alignment was designed to allow flat summing through the crossover. I then set the Fc to 1KHz right in the middle of the most sensitive part of the hearing range to enhance any anomalies one might hear if they existed. Then just made it a stereo HiRez DAC.
No one could tell they are listening to 16-poles of digital filter. It just sounded like a really good headphone system using an iFi iCan and HiFiMan HE500 phones.
A long time ago I rebuild a pair of VMPS RM40 speakers using L-R 8-pole filters in a digital crossover and sounded very good after testing, so this is something useful.
Try doing that with a passive crossover!