Hey Nick,

I may have a suggestion which could easily/cheaply offer further sonic improvement. Based on the photographic evidence you've provided, I'm guesstimating that the absorbent room treatments you have scattered across your back wall are only a couple inches thick. They are made of fiberglass, mineral wool, or recycled cotton I assume? If you double or even triple the absorbent material thickness to about 6" just on the 2'x 4' area immediately behind the listening area, your absorber will effectively reach much further down, right into the midrange. With your ears that close to the reflective surface behind, The broader band the absorption, the better. We want to damp those early reflections out of existence completely over as wide a frequency range possible (not just the high frequencies). Doing so will pay further dividends in the spaciousness of the soundstage and clarity of the stereo image.

Happy Trails!
Vince@Freewheelcycle.com

2ch: Jay's Audio CDT2 Mk3, PS DirectStream Dac, Oracle Delphi VI/SME V/Benz LP-S, Coincident Statement Linestage, Foundation Research V5 Phono, JL Audio CR-1 xover
M-ch: OppoMod 203, Anthem AVM60, 2x 557
2x or 5x ATC SCM20ASL mk2, 4x SCM12i, 4x Seaton Submersive HP, AM2.0 sub EQ
Video: JVC X990, Isco 3L A-lens/sled, 105" motorized 2.37:1 AT screen