Yesterday I did a fresh run. I’ve decided to put the phase on my back subwoofer on 180 degrees. I couldn’t believe the response I now have. I also tweaked the response with the ratbuddy app and the result is mindblowing. \n\nSo my findings are that if you use a back sub, one can put it on 180 degrees. When I used the 0 degrees setting I always had a huge dip between 20 and 40 hz. It was not fixable after checking with REW and using the sub distance tweak. Now it’s flat, and I can’t believe what I missed all this time in terms of bass definition. It’s a sonic bliss now. \n\nResponse after Audy call:\n\n\nResponse after tweak with Ratbuddy (3db house curve, and DEQ off):\n\n\nBy the way, I did limit the correction to 500hz on all 9 speakers. Beautiful!