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Treatment strategy for my small mixing room
Posts: 3
July 1, 2018 - 5:55 am



I filled the free room analysis form and in the end I was suggested to place my questions to this forum.

I’ve tried to gather as much information as I can to be able to make a clear vision on how to treat my room properly. I’ve learned a lot but want to summarize my knowledge of some basic principles so you can let me know if I’m on the right track, also some questions already on my mind.

So that others can have the info too my room dimensions are W8,17ft, H8ft, L11,35ft. I know it’s horrible, and I will build a dedicated studio in a year or two but for now treating this room is vital and my only choice.
My amphion one15 monitors have 5,5inch drivers. I’m listening at low volumes. My house is made of wood so the walls are pretty much two layers of drywall – 4inch wool insulation – layer of other insulation and wood panels etc.. at least I would assume this structure keeps less of the low frequencies coming from my speakers trapped in my little room the way thick concrete walls would. So does noise from outside get in my room better too I know..

So principles I want to check I have got right:

-My room is so small diffusion won’t be my best bet to the front wall (behind speakers) because I can’t get optimal distance and because we can assume there to be a lot of pressure that needs to rather be absorbed in this kinda room.
-At first reflect points broadband absorbtion is a good choice for my room
-In a room this small there is problems all around the spectrum so leaning on broadband absorbtion on most parts of the room would make sense
-Broadband absorbers that would reach all the low frequencies too would need to be so thick they could barely fit in my room at all, so it would make sense to also do dedicated effective bass absorbers to attack low frequencies solely. Limp membrane absorbers could achieve better absorbtion on low frequencies without taking as much realestate in the room.
-On the front wall there will be a lot of pressure so there would be a great place for bass absorbers, but a limp membrane bass absorber wouldn’t be my best bet at first reflect points because they don’t absorb higher frequencies that much so on the front wall I could place like 1m high limp membrane bass absorbers on the floor so they would absorb low frequencies behind my desk and on top of those I’d put thickest porous broadband absorbers I can fit in my room.
This way I would treat all frequencies and my first reflect points would be tamed to the best way for this kinda room.
-Ceiling is a great place to put really thick porous absorbent panels cus there’s a lot of space even though the room isn’t higher than it is. Ceiling could be great for diffusion, but in a room this small once again not a good idea.
-Diffusion would be good to have on the rear wall, but my room might be even to small to afford not to put absorbtion there too. However, I should not put absorbers absolutely everywhere cus that would kill the room totally so either I need to not treat every inch of my room or I need to choose where to put diffusers. I’m thinking I could put diffusers on the rear side of my room but not in the first reflect points, maybe in the rear corners like 1m from the floor to be on the level of the monitors and maybe in the ceiling in the rear side of the room and side walls behind the listening position where is no first reflection points. Always not from the ground up cus having diffusers only at the height of the monitors would give me the possibility of putting absorbtion under the diffusers.
-I should try to get effective limb memrane absorbers on several places in the room but not in the first reflection points, so great places could be rear wall corners and front/rear wall below level of the monitors, like 1m high panels on the floor.

I just bought the full diy build plans bundle and was thinking of building BDA traps to use the way I described about limp membrane absorbers. The diffusers in the plans seem very smart and effective too, so I’m thinking of building those too to use as explained. For broadband absorbers I’m planning on using at all first reflection points I’m simply thinking of building 150mm (~6inch) thick panels out of pretty low density stonewool for best broadband absorbtion at this thickness when using insulation materials.
(Based on this calculator)

I do have a question about BDA membrane panels. The dimensions meantioned in the build guide are just examples right, is there a guide on how to measure/calculate the right dimensions to create the right trap for my room? I can get my room analyzed to know what frequencies to tame, but I do not have the information on what dimensions correspond to what frequencies in BDA absorber as I found nothing about that in the guide. Am I missing something?

So, based on these principles I ended up with that kinda strategy. I hope I can get some advice on what I’m missing or getting wrong etc. I’m here to learn!

Huge thanks in advance! :)


Posts: 559
July 2, 2018 - 12:44 pm

E, You will need 160 square feet of broadband absorption from 30 – 6500 Hz. Place it along the front and rear walls. You must use our carbon technology because you need the most absorption horsepower you can get. Our carbon technology ships from London.

Posts: 3
July 3, 2018 - 10:01 am


I did meantion I’m planning on building your BDA absorbers DIY and getting as many of them as I can. Sorry that I called them misleadingly membrane absorbers in my first post, I always meant diaphragmatic absorbers!

1. Is your activated carbon still available for purchase to use on DIY builds and does that ship from london too?

2. I’m also still curious if building those diffusers of yours I meantioned and using them as described would make sense in my room.

I’m really interested in this technology and I will be building a real studio in a year or two. Hopefully then I will be busy enough not to have to time to build any DIY stuff my self ansd order the real deal to get it absolutely right. Thank you for your videos , all help appreciated too :)


Posts: 559
July 3, 2018 - 3:21 pm

E, Carbon ships from London. Foam the states. Build low, middle, and high-frequency absorption first and foremost. You must get those three ranges as balanced as best you can. You then introduce diffusion. Without LMH balance, diffusion will make your room sound worse.

Posts: 3
July 3, 2018 - 8:58 pm


Ok cool, I will start with building the absorbers first and taking measurements and tweaking the room until the frequency balance is as good as I can get it and only then look at the possibilities left for any diffusion. Makes sense, thank you!

I can’t find your carbon for DIY projects anywhere, can you give me a link to the product or help me find it? Thanks!

Posts: 559
July 4, 2018 - 6:14 am

E, Our carbon is proprietary and ships from London. Send me the number of units you are building and a ship to address and I will calculate the total cost for you. Send to

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