Request for assistance please room treatment


I do have it treated now, but I don't think it's correct. I need to treat it properly. I've tried a multitude of different positions, absorption, diffusion, trapping, etc. and my walls are starting to look like swiss cheese. I'm at the point now where I need to strip the room, putty, sand, and paint. But when I re-install the room treatments, they have to go in the correct position the first time. This is where your assistance comes in. I've tried many different web sites and so on, but it all seems best guess. I'm hoping to lean upon your "experience".
My room is 22'long, 11'wide, and 7'4" high, and is in a finished concrete basement. I look forward to reading your suggestions.
Thank You.
128x128shawnlh
Mesch, I assume you are the OP. FWIW I found the XLO disc fine for fine tuning a system, but for helping to identify the existence and location of nulls and nodes you can't beat using a SPL meter (as made by Radio Shack) and a frequency test disc as made by Stereophile.
One more thing. Anyone who has Sonex anywhere in the room is advised to remove it poste hasten even in small amounts Sonex does something unfavorable to the sound, maybe it's the open cell construction, who knows, making it sound phasey and unpleasant. Try taking all Sonex out of the room and see what you think. Sonex is one of the most insidious, sonically disastrous products ever perpetrated on naive and gullible audiophiles. And it looks so cool, just like an anechoic chamber. Lol
Now you know why acoustic design engineers get paid mega bucks. All will tell you designing a concert hall is a crap shoot.
Nope, not the OP just someone following this thread. I do own a RS sound pressure meter and a frequency test CD. I like the sound of my room however think with further exploration might be better tuned. As stated above, it takes time and effort. Part of the fun!

Thanks Shawnlh for the opportunity to share your thread.