Don’t know if this works but putting mineral-wool in one of this boxes from Ikea could save a lot of work:
and a bit smaller
2 Likes
Could work. It adds mass to the room which helps. But without a sturdy frame it will be hard to position them upright I recon. Certainly a neat idea though.
you could be right, but what if i hang them from the ceiling … and wall?
just when i need them
Yeah I wonder if that will work since the frames are a bit floppy.
Easily solved by making a simple wooden frame and mounting this to it. Then mount that to the wall.
well, let’s say i just want to use them when i need them …for example in my living-room
1 Like
Worth a try yes.
I do think adding a wooden frame would make it easier to temporarily place them on a wall and ceiling. But it depends how sturdy these things are. If they are a bit floppy you’ll have a hard time hanging them without a frame I think.
But, acoustic wise adding multiples of these in the room will certainly help 
1 Like
This guys has a couple of videos on constructing sound absorbing panels. His latest:
They’re usually very cheap and very effective.
3 Likes
Looks like they might have a bit of a frame built in already, but mineral wool is dense so hard to tell if it would work. Maybe a little small as well.
Very nice.
These won’t do a whole lot for sound below 100hz though.
That’s a pity, perhaps his blanket-based ones would do better.
What DIY/ ‘economical’ solution would you suggest then?
The panels I built myself have 2 layers of 10cm thick rockwool. That helps a lot. Recorded a video about that process as well. Maybe I could edit it and release it anyway. Kinda gave up on finishing that video project, but might be helpful anyway. I actually based my diy absorbers on this video: https://www.youtube.com/watch?v=fiJ6mI450c4
I used two layers of Rockwool 221 panels per broadband absorber and a wooden frame to hold them in. Mind you, it’s not a light solution (panels are 5kg each or so).
You can find information about the absorption properties of different densities and thickness heck here: http://www.bobgolds.com/AbsorptionCoefficients.htm
Unfortunately I can’t find one of the measurements done by someone especially about the absorption below 100hz. If I manage to find it I’ll post it here.
Rockwool 221 has a density of 55 kg/m3, if you look at Roxul Rigid Rockwool on that website, you’ll see that a thickness of 10cm at 56 kg/m3 will have great properties for frequencies around 125hz. More dense material has the side effect of reflecting higher frequencies, which we do not want.
the measurements I cannot find atm, showed that lower density + more thickness had much better properties below 100hz and above then less thickness and more density.
That’s why I chose to use 20cm rockwool panels. Having said that, my current room is not suited to mount these on the wall and have therefore placed them on the ground where most bass build-up was present. It helps immensely but still isn’t perfect. But it’s good to realize that even if they aren’t mounted to the best spots in the room, they still have effect. I’ve now added a subwoofer and unfortunately it has emphasized the problems my room has with 100-125hz. below that it sounds great. So I’m going to try and shift them around the room to see if I can improve things in that frequency area.
2 Likes
Great!
I’ll have to check all of that it later 
whats the name of the ikea thingys?
Skubb
1 Like
I don’t want no skubb, a skubb is a guy that can’t get no love from me
2 Likes