We moved the HS-24 into the theater today for some testing. This is the setup...
Four UM18 full marties, one in each corner of the room on two NU6000DSP
Four SP1804 nearfield in a 12 cu^ft cabinet tuned to 31Hz on one NU6000DSP channel A
One HS-24 MKIII in 19.64 ft^3 tuned to 17Hz on NU12000 front wall, just off center. See Pic
Having multiple 18s fixes the nulls and makes the MLP the best spot in the room. The single 24 puts a nasty null at the MLP. For movies, this is a terrible choice. However... The back wall is insane with the 24. It makes my eyes water, makes it difficult to breath with the right frequency, and will move the door about 8" with the right frequency. It will push and pull the door. If there was a way to fix the null at the MLP, I would absolutely take the 24 over the 18s. So for now, she stays in the living room.
The REW graph...
Green is the theater setup, 4 UM 18s 4 B52 18s. Full EQ applied.
Purple is the HS-24, no EQ.
Both measurements were taken at the MLP.
Please excuse the mess!
The HS-24 peaked at 124.5 dB while playing music tonight.
JVC RS-540, Sony UBP-X800, Onkyo TX-RZ730 (7.2.4), Onkyo M-5010, Elite Screens 100" 16:9 (Spandex AT DIY)
DIYSG 1099 LCR, Polk TSX-150C (DIY) Atmos, Yamaha NS333 Surround & Surround Back
Triple HS-24 mkiii sealed, Dual SAN 214.5 Devastators, Dual Crowson actuators, NU12000, NX6000, XLS-2502, MINIDSP 2X4