Contact a professional, such as GIK Acoustics for assistance. Reputable manufacturer of acoustic products, very reasonably priced, always helpful.
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I had similar issues - was looking for room treatment that provided a significant improvement in acoustics without looking like a recording studio. GIK, ATS, REAL Traps , ACS, etc all offer excellent absorption & diffuser solutions, however; they are bland and not ascetically pleasing. Finally found a solution that has a superior WAF while providing the improvement I was looking for. Check out Viacoustics.
I have installed the Wavewood Pro 60; Square Tile Pro 60 and Flexiwood A50's which made a significant improvement in bass response and mid range clarity. When non audiophile folks visit my home they often ask where the decorative panels came from...which confirms my choice.
These can be acquired at Music Direct for about $85/panel. If you can send an email address, I would be happy to send you pics of my set up for comparative sake.
Hope this helps,
Drapes are the best, low cost solution. Penney's has a good selection, all I am sure could get a WAF. Best of all, their returnable if sound is not improved. Also, 'round out the cornors' on that wall. This can be done at low cost. Suggestion, West Elm recently was selling round bolsters, 36 inch, for two for $60. With two sets you have very inexpensive 'traps'. Again, if they don't work out back they go, as West will pick up for a full refund, including shipping.
As you have found, the upper frequencies are easier to manage even with aesthetic decor. You could ultimately address initial reflection points with panels to help with reverberation. Tips: Absorptive material is more efficient when used on all surfaces rather than loading up on just side walls or whatever. Also the material should be as thick as 1/4 the wavelength to be addressed.
The lower frequencies are going to be a challenge. Wall (porous) panels are not going to help with room modes. You could employ broader band panel absorbers. And you may be able to get an idea of modes using online bobgolds calculator, but unlikely its going to be wholly accurate.
If you are able to place speakers using golden ratio, that may be a better staring point. The issue is the golden ratio placement can be tough in small rooms. You may have to finagle it some. Yours speakers are placed at distance of a multiple two which is not likely a good starting point.