Acoustic Treatment: My room acoustics with no treatment

What size acoustic panels should I put in this room to combat the remaining freq that need to be removed /reduced? This will be a mastering control room. i plan keeping the room look the same being that acoustics in the mid and high are pretty good with no treatment not being a finished side of the basement









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With speaker isolation pads and my right speaker 2 ft away from wall.mdat (641.1 KB)