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I would try making the right wall the front wall. That will allow symmetrical front soundstage. Your speakers are small enough that they will benefit from close placement to the front wall, which will improve their bass output and reduce midbass smearing from front wall reflection. They can be placed wider for more realistic imaging, especially with center channel filling in the middle. Sidewall reflections will be much less noticeable, probably not needing damping ymmv. All surfaces are hard, some are concrete, so you will benefit from damping as much midrange reverberation as possible to gain dialect clarity and better tonal texture. Carpet or rug, ceiling amplitude diffusion, etc. The sub is probably better against a flat wall than in a corner, or at least put in the solid wall corner, not the corner with thin door with closet behind (same as alcove which is acoustic no-no.) Sub placed right behind listening position allows turning it way down to minimize bass modes, while still achieve proper bass SPL because you are very close to it. Adjust speaker and sub distances as accurately as possible in your receiver.Welcome to AudioCircle!
How does the room measure?With a $90 UMIK-1 and an HDMI cable from laptop to home theatre receiver, the free REW software could identify the reverb time (RT) in the room across the frequency range above 200 Hz and let you determine where the bass highs and lows are for the room.$90 is a bargain in the context of $1000s of room treatments: if you measure the room and send that with the room dimensions and speaker locations to GIK or others, they will be able to give you data-driven advice on what to buy and where to put it.One could eyeball it, but with the time and investment planned, that doesn't seem optimal.https://www.youtube.com/watch?v=lVfxxUEhmnQ
Wow. That's a tough room. Perhaps near field listening is your best bet.
What are your goals? Do you know what you’re trying to accomplish or fix? I agree making the rh side wall the front wall would give you the best opportunity to correct what’s left. In addition to the funky geometry you’ve got a lot of hard surfaces to deal with.
Flip the room 180 degrees putting the TV under the window (no more window reflections in TV anymore either). Bass will now go into hallway making room less boomy.A big area rug will control a lot of the echo, that should be #1 no matter what you do.Blackout blinds or cellular shades from blinds.com for acoustic treatment and make room pretty. Too much treatment/absorption on front TV wall will deaden the soundhttps://www.blinds.comA few big plants diffuse sound and make room pretty too. Bamboo palm do well in low to medium light, all palms need bottled or rain water, tap water is usually too hard.The GIK Impression or Acoustic Art Panels will make your house look like a home and not a recording studio.
