Originally Posted by trp3383
Ran some more sweeps, this time with mv at 0 and no deq. Also attempted subwoofer distance tweak. If I plan on listening at -15 to -20 can I just bump the trim on the sub 18db? It's at -10.5
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Those long term compression sweeps look great. It looks like compression doesn't begin to set in until you reach what I might call the 112 dB sweep. Since reference volume, for movies, is 85 dB on average with up to 115 dB peaks in the LFE channel you can probably just about hit that level without any compression in your room. If you wanted to really be safe maybe setting the volume limiter on the receiver to be - 3 dB from reference.
I am planning a theater build for a 1700 square foot enclosed rectangular room, which is really close to the size of yours. I'm surprised that the pair of L22s can get that loud without compression setting in. I was planning to get a pair of F25s for my room just to be sure I can hit reference volume peaks in the LFE channel with any compression setting in, but maybe a pair of L22s or a pair of F15HPs will get me basically there.
Where do you have the subs placed in your room?
Also, it does look like just under 70 Hz you are measuring at a small null, looking at the CC + Sub measurement. You might also try to measure the mains + Sub, to see if you get the same thing. I bet you will. If you want to try to fix it, I think you have to either move you seating location, move your subs, or play with the phase on one of them to try to get rid of the null. In doing this you might move it to another frequency, but it would be nice if you can get rid of it all together. I only have one subwoofer right now and my subwoofer only has a 0/180 phase switch. I was very lucky that just flipping the switch got rid of a null that I had. It gave me another peak though, but those are fine since the EQ can fix those just fine.