Thanks again for the follow up.
Yes the two measurements have some significant differences and is where I'm a bit confused. In the attached figure, It shows my two measurement from the earlier post => one is at 80db and the other is approaching 90 (very close to clipping during the measurement and I had to adjust). The latter shows a lot going on from 20-50hz v.s. not much ringing in the other one.
So the louder you perform the sweeps at, the more you excite the room and thus more ringing? If so, then what determines a proper sweep volume since the first graph "looks" better then the last one. IOW, you stated to perform another measurement at 90db since the previous measurement was too low, what does one look for that shows too low of a level?
Yep the room dims are 11x24x7. Shooting down the long wall. Mains are 8ft from front wall, 44" in between - from inside edge. MLP is about 70" from center line of the 44". Toed in so as to converge about 1ft behind MLP. I have tried a lot positions and this is, so far, the best. This configuration is also in the spot least likely to excite room modes.
I can change the xover point (not necessarily to small or large) on the mains and sub, but so far have preferred to play the mains full range with the subs in a support role crossed at 50hz (subs are 2 PSA XS15's).
The bass/lower frequencies are very
important to me, my preference for sure. I'm pretty pleased with how much (for the better) I have improved the room with the treatments I have in place. Sounding very good right now. However, I would like to, if need be, to make proper trapping tuned to what REW indicates the problems are. e.g. Helmholtz, tuned traps etc.. Whatever it takes!!
At least to experiment with. Although I wouldn't want it to get too dead etc,,