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Edit: I thought for sure your original picture was upside down, but now I see it isn't.
Issues I see:Ringing (slow bass decay) centered at 45Hz. It is over 1/2 second. As you suspected, this is the room. Use tuned traps or thick dense absorption like OC705 4" several layers on rear wall, etc to damp this resonance. Put kraft paper or thick plastic drop cloth material or even thin masonite board over the absorption to prevent it killing the HF. Use your mic to find the spots with the lowest amplitude response at 45Hz and put your traps there. Low amplitude = high velocity, and absorption works by reducing air velocity. Diffusion can't work that low. The only other option I know is active cancellation, where you put bass driver at the back of the room and delay the launch so it collides with front wave at a position behind you and they cancel each other. You sit in front of the cancellation zone and only hear the front wave. Your room is 25 feet long it could work for you. AC member Scotty is an expert on this. Search for his posts about bass treatment, etc.That steep rolloff above 6kHz. This is something system-related, like a DSP filter, or rolled off measurement test signal. Hopefully nothing's broken. The huge peak at 450 and huge dip at 3kHz will both seriously mess up the tone of acoustic instruments, voices, etc. But fix the 6kHz rolloff first, it might cure these also. 450Hz is only 30 inch wavelength so it's not room mode. Maybe some other reflection?Your speakers are capable of far higher performance than seen in your measurement. Above 300Hz you should be looking a lot better than you are.Peaks at 60Hz would be suspicious because appliances make 60Hz noise, but at 45Hz it's all room, especially because the offending wavelength matches a room dimension. You don't have to calculate what thickness trap for 45Hz. You will need far more than you have room for. Just do what you can, read how bass traps work so you can optimize them to your specific concern. Frequency tuned traps might work more efficiently than broadband since you have a specific freq to damp. Place absorption at locations with low amplitude at the offending freq because low ampitude = high air velocity, absorption works by slowing velocity.Maybe EQ can reduce room resonance? good luck!Rich
Ringing (slow bass decay) centered at 45Hz.
Ever hear the old joke about someone "having a great face for radio"? I think what we have here is the perfect room- for headphones. Not so much for speakers IMHO,,, at least not the ones that are in it. A pair of mini monitors and maybe a sub (not too big) would probably work out better. At least then you could get the mains speakers out of the corners, which is probably causing many of the problems you are struggling with. Then the sub is piling on. Too much bass in too small a space. Maybe looking at speakers designed for corner placement also, but there really aren't many I know of.