Large speakers plus EQ, what have you done?

You can address peaks but not EQ your way out of modal nulls.

("Positional EQ" maybe, i.e., move seat and buttocks out of null)

Back in the late 80's/early 90's i started learning the effect the room had on sound and, going to the library (how quaint?) did research on sound and room effects.  What got me going on that track was an article in [i believe] Stereo Review in which the author talked about EQ and sound curves in various concert hall "best seat" locations and how measured response at those positions was never "flat"--As i recall from the article it seems the best seats had a slightly boosted bass and gradually began rolling off after 10KHz to around 6dB down at 18KHz. (Approximation from admittedly defective memory)--Anyway,  at that time I owned Cizek Model 1 speakers that supposedly reproduced usable bass down to 25Hz, although i never really tested that spec with organ music or the like. What i did know was that in the room i had my system i was not happy with the sound which was extremely constrained by WAF  so i began exploring whether i could EQ my way out of it--i purchased an ADC Sound Shaper SS-525X which billed itself as an "Automatic Computerized Equalizer/Analyzer"--it had a pink noise generator with an interesting feature:  you could press a button labeled "set flat" and it would generate pink noise and automatically adjust the sound at your listening position (where you positioned the included calibrated mic) to perfectly flat frequency response. From there you could adjust the EQ sliders to design the frequency curve you desired--which BTW did not match slider position but rather a complicated summing of adjacent sliders--took some practice.  I first listened without adjusting the flat response and found that sound very unpleasant--tipped up at the high frequencies and the bass was "lifeless"; however, when i adjusted to one of the published best seat curves the sound improved considerably and i was happy-- so the use of EQ really helped a situation where i couldn't treat the room or move the speakers from the corners.  Now i have a dedicated music room, albeit small so i listen nearfield, and i don't find that i need the equalizer--my components and speakers are considerably better and the sound is so good that i don't want to mess with it--i've handled room modes by room treatment and speaker positioning--but i may one day put the ADC back in the loop and experiment just to see what happens--it can be bypassed for easy A/B comparison but i've been reluctant to put it in the signal chain even in bypassed mode simply b/c i believe in minimizing equipment in the path.

Just for the record, flat measurements are only meant for anechoic and quasi anechoic situations. Harman and many others have a lot of writing available on how speakers should perform at the listening location.

Actually flat at your chair sounds horribly bright.

Among others, check the B&K speaker curves or the standard Dirac curves.

@erik_squires "Horribly Bright" was certainly my experience when i adjusted to flat at the listening position--that plus lifeless bass.  Curious why you're collecting other experiences?  Just for fun or ?

@wyoboy because I’d like to know how well this combination works out in general. This will help all of us learn but also help me understand what methods work for others and not just myself. This helps me make better recommendations.

Like, if it was 90% negative, even if it worked for me, I’d know to avoid suggesting it.

Also, I have an upcoming fully active speaker system I’m building. Knowing any pitfalls from users would be useful even if I think I know what to expect, but if I mention I’m doing that I’d have many people jump in and try to help me design them. I already know the parameters really, so didn’t want to invite that kind of suggestions until after they’re built. At the same time, my major home appliances all reached college age so this project may be later in 2025 than I had hoped for.