What kind of room treatment

[Geertidow]

Setup:
1. Focal Chorda 816 with custom EQ as posted in original review bij Amir + custom made 2 x 10" subwoofer.
2. Room = 5,5 x 3,3 meters but on top floor, so diagonal ceiling (how to phrase this in English) in combination with a dormer.
3. Sub crawl method to position sub in left front corner (to the left of the left speaker).
4. Applied some EQ below < 150 Hz (38, 65 and 119 hz peak on the sub).
5. Shown is an RTA measurement with moving microphone method.
6. Room is untreated except for thick curtains in front of windows of dormer (dormer is 2,1 meters in height) and a little rug.
7. I have DIRAC at my disposal but haven't measured it as yet.

Goal: hifi only (no films, youtube, whatever).

Questions:
1. If I were to apply roomtreatment, what should I do?
I can probably EQ the peak at 160 hz, I haven't (room) EQ'd the speakers, only the subwooer
Bass traps? Thick carpet?
2. Any more logical positioning of speakers?

I am in no need of building a mixing studio so I kind of want to keep it esthetically appealing. A cilindrical bass trap seems to fit in nicely, but will this solve anyting?
Already really satisfied with the sound, but always open for some improvenet.

 

[Geertidow]

After satisfactory positioning.
REW measurement accessible through: https://file.io/JTMN69N80jUH
Accept the 180 hz dip? Not something dual subwoofer placement will solve.
I'll take any advice!

 

[Bjorn]

Unless you treat large surfaces, bass traps will primarily effect the domain behaviour. Which is very audible, even if it doesn't effect the magnitude response much.

It's important to focus on specular reflections and treating reflection points. Mainly with absorption that works effectively down to Schroeder (or lower) in this size room, though some diffusion or hybrid absorption/diffusion might be an option at certain points - depending on the arrival of time.

 

[Geertidow]

Unless you treat large surfaces, bass traps will primarily effect the domain behaviour. Which is very audible, even if it doesn't effect the magnitude response much.

It's important to focus on specular reflections and treating reflection points. Mainly with absorption that works effectively down to Schroeder (or lower) in this size room, though some diffusion or hybrid absorption/diffusion might be an option at certain points - depending on the arrival of time.

The arrival of time sounds very dark.
So what should I do?