Thanks Jack, you are right - the DEQX will introduce delay of its own. I did not think of that. Thanks to your response, I had to google up some audio delay circuitry, to see whether it would be possible to integrate that into the crossover.
I have evaluated the DEQX several times now, and I can safely report that I DO NOT LIKE what I hear. Against my SACD player, there is a loss of resolution and dynamics, but this is nothing compared to what happens when you put a top flight vinyl system in front of it. The DEQX simply falls way behind. If I say that the performance hit is 10% with my SACD player in front of it, it would be closer to 30% with my friend's vinyl setup (Basis Debut Vac + Vector 4 + Transfiguration Orpheus + ASR Basis Phono). On that system, the DEQX homogenized the sound to the extent that the vinyl source sounded only slightly better than the CD player.
Nevertheless, I had an utterly convincing demonstration on my own system and I know precisely where I would gain, and where I would lose. However being a typical neurotic audiophile I do not want to go backwards in any way, and I especially do NOT want to compromise the midrange/treble resolution that I paid good money for.
At this stage, all I can tell you (as a fellow Acapella Violon owner), is that the midrange/bass crossover is very poorly sorted. There is room for improvement. I don't know if you are happy with your bass or not, but I'm not happy with mine.