My REW experimentation in my basement system

I've been busy with REW lately..using it yesterday to find the best location for my single sub. I found it left of the fireplace as shown below. The couch spans 6' across so I took 3 measurements, at the center, 24" to right of center, and 24" left of center.


Here's just the bass response with no PEQ;


Today I took full frequency sweeps with various settings of YPAO. The results are not very good and I'm wondering if being too close to the backwall is the culrprit at...

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