TOPIC: rephase for subwoofer sharp drop @72hz

hi,
i have subwoofer measurement using REW, and the phase are not good.

attached please find my measurement, i measure the subwoofer in 7 position, and generated EQ using REW and applied to my 2x4HD.
the chart 10 is the measurement after EQ, and the phase has sharp drop.

so i use rephase to adjust it but i am not sure how to deal with a sharp drop in phase at around 72hz.

could any one please give me some hints?

thanks.

attachment

For the sake of completeness, this question was cross-posted and discussed here: www.diyaudio.com/forums/software-tools/2...255.html#post5577684