Martin Walker wrote:+1 for 60Kg/m3
After installing half a dozen RealTraps after reviewing them for SOS years back, I still needed more trapping, so I bought some 45Kg/m3 rockwool that I assembled into 4' by 2' by 1' megachunks, sprayed with the recommended dilute PVA adhesive (to stop the fibres shedding), and then simply wrapped them in butter muslin.
They made a very real difference, but have sagged a bit since. Mine were all floor-mounted, so if you're considering wall-mounted traps then 60Kg/m3 makes a lot more sense.
I have a roll of what i believe is mineral wool. Well not a full roll but darn close. It was left over from building work we had done a few years back. Its too expensive to simply dump so I mailed the manufacturer to ask what it was and explained what I need it for. They replied after a while and said they wouldnt recommend for sound treatment and sent a link for some other stuff but Id need to order it online. So I might have to simply buy those rock wool slabs or got to Thomann who do a good range of actual sound treatment products. You know if my test mic would just get here soon I could test what i have using the REW software.
oh....quick question guys. Theres a builder doing work next door. Nice lad from England so i was talking to him just now about what Im at. He wasnt sure of course about sound treatment but....as far as making a light weight frame was concerned he showed me the aluminum studding they use now. Weighs nothing. But would an aluminum frame on your absorber defeat the purpose due to reflections? I could probably cover the frame with fabric. I dont have a pic but I could probably send one.