I am planning on making some broadband absorbers/ bass traps. In the UK it seems to be a lot easier to get Rockwool panels. I have not quite decided on the density yet but I hoped to make the 2"x4" panels without frames. Would a rockwool panel 45kg/m3 slab be sturdy enough to just wrap in fabric and hang on the wall without a frame?
I also plan to attach wooden panels on the wall where the absorbers are going to go and then attach the panels to the wood using heavy duty velcro. That way there will be no frame and a gap behind the panel for better absorption at lower frequencies.
And the last question I have is this: If I make a panel out of 100kg/m3 rockwool (which will reflect some higher frequencies) and then attach acoustic foam to the front of it (to absorb the higher frequencies and let the lower ones pass to the rockwool), then wrap in fabric. Would this be effective at absorbing more frequencies overall?
My main problem is my room is a converted singe garage and after decoupling the studs from the walls and double sheeting I have been left with a room measing around 7 x 9.5. Enough space for my gear but pretty poor for acoustics so I just need to trap as much as I possibly can without too much further reduction in room size.
the 45kg/m3 is a bit soft for free-form panels. you could try some corner bead - metal or plastic and some rivets to make a light frame which will be sturdy enough and give you clean edges.
I also plan to attach wooden panels on the wall where the absorbers are going to go and then attach the panels to the wood using heavy duty velcro. That way there will be no frame and a gap behind the panel for better absorption at lower frequencies.
There is another thread a few days ago with a person wanting to use velcro. I wold him I did not think it would work and he confirmed that by trying it. I would just build wood frames to put the mineral in.
I shall avoid the velcro idea! Thought that would have worked
Glenn what is your thoughts on 100kg/m3 rockwool with an acoustic foam or lower density rockwool facing?
I read somewhere recently that as rockwool this dense would reflect higher frequencies then some acoustic foam on the front will make it more efficient across more frequencies?
Seems to make sense but i have never read that before and the velcro made sense to me also so my assumptions dont count for much! haha.
Glenn what is your thoughts on 100kg/m3 rockwool with an acoustic foam or lower density rockwool facing?
I read somewhere recently that as rockwool this dense would reflect higher frequencies then some acoustic foam on the front will make it more efficient across more frequencies?
What is the thickness of you absorbers? Higher density material reflects ALL frequencies as thickness increases.
Andre
__________________ Good studio building is 90% design and 10% construction.
Glenn what is your thoughts on 100kg/m3 rockwool with an acoustic foam or lower density rockwool facing?
I read somewhere recently that as rockwool this dense would refle
I have never tested 100kg/m3 but I would not think it would reflect upper frequencies. Well everything does reflect some what but not reflecting like a wall would.
I shall avoid the velcro idea! Thought that would have worked
You could make velcro work - did you see the Letterman where they velcro'ed Dave to the wall? If velcro can hold Dave, it can hold rockwool. But frames and solid attachment as advised above is probably the better plan.
I have highlighted the 100kg/m3 data in bold and it would seem that the 300mm gap from the wall doesnt have hugely better results? All be it different densities.
I would prefer to hang directly on the wall to save space. Seems like i would get very good results going that?
100 kg /m3 rockwool is usually a bit less absorptive at mid frequencies but it depends a lot from brand to brand and even those measurements have some uncertainty involved.
You could make velcro work - did you see the Letterman where they velcro'ed Dave to the wall? If velcro can hold Dave, it can hold rockwool. But frames and solid attachment as advised above is probably the better plan.
It is not due to the weight but because rigid fiberglass is not solid. The tape on the back of the velco has not much to hold on to.
BTW the Letterman vecro thing still cracks me up.
It is not due to the weight but because rigid fiberglass is not solid. The tape on the back of the velco has not much to hold on to.
BTW the Letterman vecro thing still cracks me up.
Cracks me up too.
I've seen a pin-on-plastic plate at the hardware store that works as an attachment for the tape but I understand it's not bomber.
The best route I found (in US) was to buy 2" 703 + fabric + furring strips.
Cut the furring strips (1.5"x.75"x8' actual) into lengths of 48" and 25.5". Buy some self drilling 1" screws. Per drill the 25.5" pieces, then assemble ( you can glue if you want to make them sturdier.
Instead of using a staplegun, use friction to hold the cloth to the 703. Cover your frame with fabric and push the 703 down into the frame tightening the fabric. Flip it over and tuck the fabric in around the back edges.
You now have a 4'x2'x2" trap. To make your trap thicker attach additional traps to the front with hinges. Then hang them on the wall with hooks and eye screws.
You can make the traps as thick as you want and they double as GOBOs. I plan on eventually setting up to use mine as a portable vocal booth.
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