Here it is. First picture is before I put up curtains and then after. I see a more even curve, especially over 2000 Hz. The bass peaks at 50/63 Hz is stronger but probably has nothing to do with the curtains. I also did a room measuring analyzing room nodes and I got some very long lasting ones in the bass, but I do not know how to tackle that. But I regard this as a step forward anyway.
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Yes I think I know Salas, it is a bit muddy, unclear bass that I find annoying. My guess is that since it is "smoother" and more focused and detailed in the mid-range and high-range, the bass problems in room sticks out more now since the rest is better. It is harder to get this under control like we all know. I have been trying to find some white damping panels to put on the wall behind speakers to further improve mid-range clarity but only found expensive ones or the wrong color (like the one I already have, does not look vg). I also have been trying to listen for voice focus, when I sit further away from speakers almost aimed directly at me it is focused but singers sound small, when I do the opposite moving forward so I can see more and more of the inside speaker wall it gets pleasantly wide and I also think you better hear the character of voices, but they sound unreal wide.
Those two bands (63HZ and the bar before) look like room modes. We all have a room sound. Striving for perfection takes to either locate in another better room (!), or use bass traps, or distributed subs like Geddes, or manipulate via DSP like with a Lyngdorf DPA-1 pre etc.
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