That is quite a hump. You say room treatment won’t fix it? from 1200 to 6300hz.
Something is out of whack. Does it give that reading with one speaker at a time or does it take both. That is a frown on the EQ. A lot of the old monitors were that way it was one of the reasons for LPads in a 3 way on the mids and highs, even UHF LPads were common in the 70-80s with 4 and 5 way speakers.
It sounds like to me you got one lively room with a lot of open flooring and ceiling that is untreated. A tree or two might help. :-) I like BIG cannabis plants. Thai plants have the perfect leaf. Thin huge sun leaves.. Perfect.. Couple 8 footer should do..
We use to use cellophane in front of the seated position on the ceiling in a fish net to tame a REAL hot speaker. Line source was good for that. If that fixed it. dress it up or get the correct treatment..
Lot of people forget one of the most important areas. right in front of you, top and bottom and between the speakers.. I pull heavy drapes between the speakers for the degree of dampening I want.. I’ve always liked the look to.. That is one of the reasons for the Queen Ann legs I use on my cabinets.. Heavy floor to ceiling drapes.. I have a throne too. :-) Well I should say the wife, she has taken over my front sound room, lock stock and barrel.
I just want my Cary V12 back in the main room and get rid of the flippin VTL mono blocks. They sound more like a SS amp than a SS amp does. They suck.. 450 MB pretty though.. On loan..
If I wanted that kind of accuracy I’ll use Krells or something.. Leave the tubes out of the mess.
EQ? I’d try a mechanical solution before I’d keep an EQ in the chain. GEQ can be passive and in parallel vs a PEQ that is in series of the chain.. More than one way to add a contour, too. Can dub the signal.. vs digitize it..