Some more experiments,
today I gave more attention to the "basic setup" before measurement to fine tune settings I need in my MacBook for correct measurements.
This link was helpful :
https://www.avsforum.com/threads/rew-for-macos-how-to-setup-your-mac-for-rew.3075106/
I learnt that this "basic setup" is VERY important, level matching by playing pink noise through REW is also VERY important.
Did a comparative of subwoofers response
Red line is "direct mode"
Green line is "AVR set to 7.1 channel"
**since there was a big dip in 45-55 Hz range, I just added some gain in PB 2000 pro to increase from "-18dbfs" to "-15dbfs"
Purple line is "after the gain applied and still no Audessey filter"
** added "-3db" more to PB 2000 pro
Orange line is after applying the "-3db" more gain to make it "-12dbfs"
All above without Audessey filters.
After this experiment, I played some go to scenes and the bass sounder more fuller, louder and also the LF effects were more impactful.
I frequently refer to scenes from John Wick 3 (john hitting hammer on floor", scene from "Arrival" where they are in Helicopter to take them to Alien site .. the helicopter blade blade rotation sound measures about 112 db and I still look for clarity as against muddy sound. I also refer to Dolby Atmos demo scenes from The Tomb Raider.
View attachment 49928
After above I also applied a PEQ on PB 2000 pro to pump up 50 hz and nearby frequencies (I know I should be more concerned about peaks than nulls) to try to boost the overall db in all frequency range of subs.
Result was even pleasant, I will share that curve toon next post.
Time spent brought me some conclusions
1. Audessey MultQT 32 was degrading the loudness the subs should show in scenes where subs need to hit 115db, though theoretically after applying MultQT 32 ... the FR is flatter but it takes away some fun of those sudden surges to "feel the base" and not only "hear it".
2. I have kind of understood where correctly to set the gain on sub and corresponding to that on AVR
3. Changing Phase of PB 2000 pro from "0" (PB 1000 is also on 0 )" to 90 made the bass more punchier and tight. I could hear that helicopter scene from "Arrival" on netflix .. the rotating blades sounded more tight and high db.
4. Achieving more db on Subs has made decay time and decay rate worst but somehow in real life I don't hear the sound degraded. Just to add, I am using a couple of Bass Traps and a lot of sound absorption panels.
Please advise if there is something terribly wrong with the approach.
