Robm321: I too have not tested any of this but I know the destruction that just a cheapo IC can do when inserted from my line stage (Aesthetix Callisto Sig) to my amps (CAT JL-3 Sig). So I would expect far worse with an electronic instrument with penny-priced integrated circuits, capacitors, resistors, horribly regulated power supply and such.
What we ultimately might gain from a flatter frequency response, and thus perhaps more clarity and less muddiness, could also result in a great loss of many other refinements, e.g., low-level resolution, harmonic textures, etc. For me, these latter sonic attributes get me more attached to the music than having a perfect frequency response.
I have recently added 4 ASC tube trap columns behind my Soundlab speakers. The added degree of clarity in the mids and trebles brought on by this caught me off guard. And I lost none of the magic in my system that I had before. I plan to plot several response curves of my room with varying ASC traps and their locations to reduce the bass peaks as much as I can. Then I can evaluate the possibility of any added benefits from an active device like the PARC. And ultimately if the PARC does bring on even more clarity due to bass peaks reduction, but it interferes with the openness, textures and dimensionality that I had before, I will have to make a judegement call as to which way to go. Perhaps on some music material the benefits of the PARC will be the way to go and other times, not at all. Hearing how it sounds in bypass mode will be important too as there will be another pair of ICs in the loop even during this time.
I think we each need to determine this all for ourself. I just happen to be a decays and ambience fanatic and I do not want to lose what I have worked so hard to attain.
John