Unsound, when I speak of the DEQX as being an "artifact," I am only saying that it is a component that is stuck in the signal path. Period!! Of course, its very purpose and function is to change ... and quite significantly so ... the signal when engaged.
Stated differently, IMO, the best scenario is one in which one's speakers are already *perfectly* time aligned and the room is perfectly neutral. Ergo, no need for the DEQX at all. But alas ... such is NOT the case with my rig and I suspect with most others' rigs.
Bottom line: 2 steps back and 5 steps forward. Net positive sum improvement, which I believe the DEQX has achieved for me.
@Al ... just an fyi. When Larry the DEQXPert time aligned my speakers, he had me shove a bunch of pillows or seat cushions in front of my speakers. The pillows attenuated the fist reflective floor bounce off the woofers. That may help with your speaker correction results.
@Psag ... your anecdotal experience is consistent with what Al reports. Your results are indeed amazing and good to know since I too am a DEQX owner.