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Welcome to Audio Circle. Maybe a volunteer can move this inquiry where it will get more attention, like...https://www.audiocircle.com/index.php?board=73.0
Welcome I came to good results with the car hood brown blanket 15mm.
Welcome!Suggest reading Floyd Toole's "Sound Reproduction" 3rd edition, the consummate primer to learn how speakers/subwoofers behave in-room.
First, your room is in horrible ratios, nearly 1:2, meaning that primary resonances will double up. In your case primary resonances are at 80 Hz and 150 Hz, then 160 Hz 240 Hz, 300 Hz, and 320 Hz.
Recommend putting up some sort of acoustic barrier to create a 7'-6" by 10ft space with another door into it.
My room follows the Fibonacci ratios: 8ft x 13ft x 21ft and I use a mid-field setup with speakers 5'-6" from the front wall.
Second, what monitors are you using? Hopefully some quality active studio monitors. Recommend something like Adam A7X, Dynaudio LYD 7, Genelec 8040B, or Neumann KH120. All are European designed/built. The Adam uses a ribbon tweeter, the Genelec and Neumann use controlled directivity design.
Third, to produce good recordings you need to hear the lowest frequencies, either via headphones or subwoofer(s). I say plural on subwoofers because every room inherently has bass peaks/dips and to which multiple subs is the best solution (as per Toole). I use 3 carefully placed subs in my audio system.
For bass treatment recommend GIK (here at Audio Circle) 244 panels that use Owens Corning 703 high density fiberglass, very effective for bass absorption. I own ten 244 panels. A backup material is Rockwool. Always check the material specifications. Avoid open cell foam at all costs! Thicker is better. Forget about curtains and the like. And add panels a few at a time and experiment with placement. Any material needs to be encapsulated to contain breathing in small particles.
I understand not wanting to use Rockwool as that stuff is pretty nasty. When I did my DIY acoustic panels, I used denim insulation which is made from recycled blue jeans. It's more expensive, but worth it, IMO.
This is what I used:https://www.ebay.com/itm/Recycled-Cotton-Denim-House-Insulation-Roll-Sound-Acoustic-Proofing-6-Pack-Rolls/373041690921?hash=item56db047929:g:9CQAAOSw-5pesBnq
Great! I really need literature to educate myself and be able to communicate with you guys. Gonna study this book. Thank you.I'm sorry, I don't understand this language yet. What exactly is this ratio called in acoustics? How do you come up with the 1:2 ratio value by looking at my room's plan? I cannot fathom what exactly that mean. Would you please elaborate more on that?Would that be possible to share some pictures as examples, or direct me to a link where I can see what you mean?I'm a bedroom mixing engineer. I use a a pair of Yamaha HS50M, an old onkyo CD player and cheap speakers as a grotboxes, for mixing referencing.I have no subwoofers. I listen to bass frequencies through Audio Techinca ATH-M50x headphones.I won't use mineral wool/fiber glass materials inside my room. Would you please give some suggestions of any material other than mineral wool or fiberglass?Isn't it better I upload my REW measurements here? If yes, which graphs should I post here that are useful to get better feedback from you guys?
Sorry your english was so good thought you were a native speaker.
DSP room correction (such as REW) is the last and least recommended option. Best to solve physical problems via physical means. DSP will only compensate for a single location in the room via artificially exaggerating responses elsewhere in the room.
Your longest room dimension is 14'-2" = 14.17ft. Speed of sound is 1130 feet per second. Dividing speed of sound by the longest room dimension = the lowest (first) primary room echo = 1130/14.17 = 79.7 or 80 Hz. Your room width is 7'-6" = 7.5ft. So the second primary room echo = 1130/7.5 = 150.6 or 150 Hz. Those numbers correlate well with what REW shows, especially taking into account the amount of clutter in the room. For instance I see a 20 dB dip at 90 Hz and a 10 dB peak at roughly 145 Hz with smaller dips and peaks at multiples of those frequencies. Not unexpected or abnormal. You're right that bass peaks/dips (below 200 Hz) is what room correction is all about. You don't appear to have much wall space available for treatments or room to move your setup away from the window, so your options will be limited. The thin white window treatment is doing virtually nothing. I'd move your setup further away from the window and buy six GIK 2ft x 4ft 244 panels, put two in front of the window, two on the opposite wall, and one on either side of your setup half way between your speakers and the listening position.
Again check manufacturer's acoustic specifications and compare to Owens Corning 703, but doubt if you'll find anything on PET or felt. Going of intuition is a recipe for disaster. Nearly all materials do poorly at lower frequencies.
