Interesting!
But everyone here speak about their gear, recorded their system and think "good sound" is born from the gear pieces synergy or optimization instead of the room optimization or lack of optimization...Room acoustic is way more complex than GIK panels and potentially way more extraordinary for enhancing the sound experience...
Myself i focused on the couple system/room experimenting in the past with my room acoustic optimization to improve my low cost system...
None of the system/room i heard here impress me, they are good thats all, and they are better than the gear system i used in my acoustic room few years ago and this is so because they are no room acoustic control and it is easy to hear it in your videos...Sorry...
Nowadays DSP is so advanced it can help a lot too (Choueiri filters) if i could i will use them someday, i will not anyway begin again with a mechanical distributed grid of tuned Helmholtz resonators...Too hard work to do...Fun the first time though...Choueiri filters used in an acoustically relatively well controlled room will do the job without distortions at all unlike my grid of resonators so good they were..
No gear design, dac,amp,speakers, crossover, even Choueiri filters, cannot replace minimal acoustic control of a room designed in function of specific system and specific ears... Small room acoustics is not the same as Great Hall room acoustics, the same principles but applied differently because size of enclosure and one pair of ears in one case and a collective in the other pose very different acoustic problem...
This is ABC of audio ...
Acoustics and psycho-acoustics rules audio engineering not the reverse...

