Originally Posted by bori
It looks like I have a peak at 20hz that my feedback destroyer does not detect. Do u think I would be better off with the antimode 8033? How low does the antimode 8033 go?
As the sound goes lower, it takes more SPL / dB for it to "seem" to be the same volume. This is why many people, including me, like some sort of house curve, or leave the gradual room-based rise from room acoustics. I manually eq'd my response flat (BFD), but left the rise pretty intact below 35~Hz. This leaves more impact for movie bass, while most music doesn't go that low. If it's an extreme rise, you can cut it a little, but you don't necessarily want it perfectly flat to <20Hz.
Leave that 20Hz peak for more impact.
But is your graph you posted before or after eq? You measure with REW, then manually set filters in BFD.
I attached my before measurement, and after eq - with 1/12 octave smoothing. After setting that up, I backed off some of the filters below 35Hz or so a bit, since it seemed to suck a lot of the power out of the low bass. So now there is more energy in the 20Hz range beyond what is shown in this measurement. I just didn't hook it all up to re-measure after I tweaked the filters.
The sub is right behind the couch, set to 70Hz xo in the receiver. These measurements are left/right speaker + sub combined. When you get the speakers playing bass as well, it really changes the response graph.