Best to measure bass at a few spots around that position to determine sensitivity of the response to mic position as dips can soften significantly with small mic movements.
Some more measurements taken.
View attachment 1293834
This shows:
Blue - Left + Sub crossover at 80
Orange - Left + Sub crossover at 100
Green - Sub only
Red - Left only
Whilst it seems crossing over at 100 instead of 80 improves ~90Hz it causes ~130Hz to suffer.
The above but with no smoothing at the 10...200Hz range.
View attachment 1293835
I've not done similar comparisons for C and R, just L.
I switched the sub to Phase 0 and that made no discernible difference. Is it worth looking more into phase graphs/distances in REW with regards to the LCR ?
I also tried left and right of my MLP but with not too much different to the results.
If you have the latest version of REW have you tried using the 'Alignment Tool'? Good not just for aligning multiple subs but also mains to subs.
Measuring timing of sub(s) to mains with REW
Here's an example of it in use, this is mine from last weekend. I took my subs measurements (orange, already aligned and EQd to give the smoothest response) and my center measurement (blue, please ignore 150-200Hz, it's a reflection from the table in the middle of the room). Looking at them...www.avforums.com
Quick sweep with both subs, certainly sorts our the 45Hz dip I had before. Need to play with REW some more to gain match and time align them though.
View attachment 1302593
If you weren't already aware of it the Alinment Tool in the latest Beta versions of REW might be worth checking out.
Measuring timing of sub(s) to mains with REW
Indeed, any speaker incapable of that level of frequency extension can be excluded... Based on your video it's not a case of a minimum of 80 Hz extension, but rather as far as I can see requiring a speaker that exactly matches the spec of -3 dB at 80 Hz, and that it is a sealed design. For...www.avforums.com