Thanks a bunch!

Nice to hear from you! Did you get the FR701? I think it's well worth investing in the fabric. It's really dirt cheap in the grand scheme of things. $250 all in for one of these modules is unreal, considering anything pre-fab is going to be multiples more expensive and not likely to perform as well. 5.5" deep modules is table stakes IMO and you really need thicker absorption for a pro room. 1.5 to 2 feet thick on the side walls and ceiling would be better. Thicker on the the back wall. Anyone using 3.5" thick panels (or thinner) is just getting hobbyist results that will more or less just make the room sound like it's got a huge lowpass filter on it, doing virtually nothing for the LF. The cotton batting is super transparent. If you can blow through it easily, it's fine. That's the test. The landscaping fabric is slightly more resistive and could bounce some HF, but that would be attenuated by the batting and GOM front layer anyways. Good luck with your room!

Hey hey. Not quite sure what you’re referring to. There is no gypsum plate in any of my designs. You’d never use gypsum in front of a porous absorber unless you were trying to create a pressure based bass trap, and there are better materials to use. Also, reverb time calculations will fail in a music studio that’s small and treated. The room cannot meet the criteria for a diffuse sound field. We never use that formula for control rooms. You’ll want to instead shoot the room with REW and look at the frequency specific decay times (spectrogram and waterfall), T20, T30. Or use the John Brandt room mode calculator and look at mean free path.

@@warpacademy what did you put in front of your pink fluffy glass wool ? You did not cover 100% of your walls an ceiling with cloth after stuffing it with glad wool. So maybe you use woof panels osb or gypsum plates. How do you calculate it ? You can never meet any RT60 norm if you just put wool into the room and cover it with cloth it would sound. Dead after 500hz so you have to have some reflective materials.in front fo your pink glass wool to just let the bass into the material and let it absorb and reflect other frequencys. It doesn't matter if you use osb panels or wood or gypsum or any anything else.

Here is my completed control room reveal: kzfaq.info/get/bejne/jsx_ksWlqcu8mpc.html. Here is a deep dive into the design of the room: kzfaq.info/get/bejne/a7yiepV8xKuboX0.html. No, none of the modules are faced with OSB or gypsum. The only gypsum (drywall) is in the isolation shell on the outside of all the interior room treatment. You don't want a control room to be very reflective. If you're designing a recording studio, then yes, you want hard reflective surfaces and no parallel walls. Control room design is very different. You need symmetry and zero specular reflections back to the mix pos. My room uses a combination of rockwool and fiberglass for porous absorption, graduated density. All of it is wrapped with the exact materials indicated in my video (cotton batting and GOM Anchorage acoustic fabric). Both of those materials are porous and absorptive. Are you familiar with the design of a non-environment room? That's what this is. There is a small amount of controlled scattering from plywood slats located about 12' behind the mix pos. on the front of the back wall modules. The front wall is hard and fully live, for acoustic queuing, and the floor is hardwood. The room is ideal for me and the type of engineering I do. It's not too dead. Some people may find non-environment rooms too dead, but that's a matter of personal preference rather than objective acoustic suitability. Look at the Northward rooms. Those are more dead than my room, or at least very similar in terms of the ETC. Hope that makes sense. Let me know if you have any other questions. Cheers!

@@warpacademy okay that's not what I'm Looking for . I want to got with the DIN 15996 for Studios, that's my target. I calculated the Absorbtion, Reflection and Transmission of the 12.3mm Gypsum and Multiplied it with the proud absorbtion graph from amroc. Now I can model my room in amroc and I got really good results for my relative cheap build

Glad you found something that works for you. Good luck with the build. When you're done, share acoustic tests if you can. It would be interesting to see them (from REW).

Hey hey. Follow the link to the acoustics course (in description) and it’s a download in the course.