Hi. It looks like you've got room resonances at about 43 Hz and 79 Hz. First thing to try is moving the subwoofer if possible to try to get a smoother response. If you have an equalizer I would try a 10 db cut at 43 Hz and a 5 db cut at 79 Hz. You'll have to experiment with the Q setting to dial it in. That's pretty simple EQ and it should improve the sound noticeably. Some bass traps in the corners of the room will also help to tighten and clarify the bass. You could also get a couple more subwoofers and place them around the room to break up modes and smooth the bass.
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