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Any guidance is appreciated
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Your response does not appear in line with the specs of a PB13 that says it is: +/- 3 dB 18 Hz-150 Hz (anechoic) in 20hz mode. Yours begins to drop at 35hz..... so there's some sort of problem.
Perhaps the location is causing the abbreviated bottom end. I would first drag the box to the middle of the room and do a near-field response on it. Put the subsonic filter at 10hz.
brucek