I see that you edited the comment. As I said in another comment, I don’t want to move the front speakers further away from the walls for maintaining aesthetics. Adding a subwoofer and tweaking its placement seems like a only viable option for me.
> You can also try measuring l+r simultaneous sound because bass is often mixed in mono.
Do you mean that those dips may decrease if I measure both speakers at once? (It’s not that bad as it seems?) Maybe worth trying.
The amount of the dip changes a lot depending on where I sit in the room.
Fixing dip with EQ in one location causes problems in other locations, that’s my understanding of why EQ can’t be replacement of proper room treatment.
Halving distance? really?
I already moved the speaker away from the wall slightly because I read somewhere that causes bass to be stronger even for front-ported speaker like DBR62. If I remember correctly moving speakers away from the walls didn’t shift problematic frequencies.
I ran room mode simulator in the past, the result suggest that I’m going to have problems in frequencies I showed in OP.
Moving front speakrers to the walls slightly changes the dip frequency and the amount of the dip, but not that much (probably because the speakers are already very close to the walls?).
I can hear the bass much better when I’m in another room (one separeted by a sliding door), but I don’t always listen in that position. I want the speakers to sound good even when I’m in the living room.