Based on your room dimensions you will have primary modes (resonances) at 40 Hz, 43 Hz, and 70 Hz, for the 13’, 14’ and 8’ dimensions, respectively. You will also have modes at 2x, 3x, 4x these frequencies, which REW is showing you.
These modes will be with you unless you acoustically treat the room, especially the 40 Hz ones, which are super hard to eliminate.
But you can minimize their contribution to the sound of your system by moving your speakers and your listening chair away from walls to the extent it is possible.
If you have a sub you can try moving it out into the room to reduce coupling with these modes.
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Main System:
Amati Futura Mains
Amati Homage VOX Center,
Proac Response 1sc Rears,
Three MC2301's for L,C,R
MC 602 for the rears
C 1100, MX 151, MCD 1100, MR 80
Nottingham Dais with Wave Mechanic
Sumiko Palo Santos Presentation
SurfacePro 3, RPi 4, ROON, WW Starlight Platinum USB, Schiit Yggdrasil, Benchmark DAC3 HGC
MX 151, OppO BDP-95, JVC RS-500 DILA projector, 106" diagonal Stewart Luxus Screenwall Deluxe with Studiotek 130 G3 material.
Lake House:
Ohm F, MC 275V, C2300, MR 77, Rega P3
OnDeck:
McIntosh MAC 4300v
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