DSP crossovers and Phono Stages

Not in the case of the DEQX HDP-5, which I own and which like various other DEQX models is remarkably transparent.

If you haven’t already seen the following lengthy thread, you’ll find comments in it by a number of members attesting to the transparency of various DEQX models. (I don’t use my DEQX as a crossover, btw, but several of those other members do):

https://forum.audiogon.com/discussions/is-deqx-a-game-changer

Regards,
-- Al

I think you are obsessed with reading about DSP and crossovers and are gaining very little knowledge.

It is time for you to experiment if you want to know more.