Had a few minutes to think about some of the measurements Paul ran. As with every room I've measured and have seen measurements posted of, Brandon's room gain begins at 30 Hz and progresses at a rate of 10dB per octave (the average of all measurements in my file is 7dB/Oct) as frequency decreases, tempered below 10 Hz by the signal chain roll off.
Bottom line; awesome room gain profile and with the 8 x 18" system he can dial in any low end response known to man. For example, my signal chain is down about 14dB LESS than Brandon's, which closes the gap in disparity of my room gain/octave vs his, and then some. Tighten up the roll off and he'll be flat to 3 Hz with headroom.
I have a Marantz loopback that is down -3dB @ 7 Hz, and I have a loopback of the Berry digital EQ, so I used those to approximate Brandon's roll off. The actual Marantz he uses may have a different roll off, but I can't find it anywhere online. It's a good idea to always run a signal chain loopback before proceeding to measurements/EQ to avoid confusing lack of room gain with signal chain roll off.
Brandon's full range FR of the mains and subs is, save for 1 dip, 10 Hz to 10k Hz (+/-) 3dB (IF he calibrates the subs flat, which, as you can see the first trace we ran, it was not
), which is certainly a big part of why it sounds so good
with all sources auditioned last Saturday.
The 24 drivers Le roll off looks like -6dB @ 100 Hz, but I suspect a bit of that may be the Qtc in 16 cubes. In any case, it's irrelevant as you can see the response with the mains at the LP is flat through cross and sounded as "tight" or had as much "mid bass slam", "punch", or whatever the hell the kids are callin' it these days, as ANY sub I've heard, which includes a few.
GTG favorite quote #1; ChopShop, while serving as the GTG chef at the grill: "Man this grill only has 2 settings... off and HELL!"