Re: DIY acoustic treatment.
Posted: Tue Dec 14, 2004 9:09 pm
“I don't have any 1.25" thickness RW6 data but Bob Gold's absorption data sheet
shows 2" RW6 flat to the wall as dropping off a cliff between 250 Hz and 125 Hz... so I reckon 1.25" flat on the wall don't do much at all on your LF resonances.”
These 30mm panels were never intended to treat the LF……and like you say they don't.
Incidently, Rockwool are selling something rather similar…… Rockwool (click on the “reverberation” link for the pdf)…
“OTOH 2" RW6 with a 12" gap aint too shabby for LF.... so I would surmise that air gap can significantly improve LF performance in this material.”
The 100mm traps across 6 tri-corners, 2 wall/ceiling corners and 2 wall/wall corners has a gap of 13” at the maximum point. These eat up the bass.
“Also, as described previously in this thread, if you could get a full ceiling treatment system of some kind, that would really help. In a room this small, that is the first thing I would have done... getting a small room to work at high SPL aint trivial. I am given to understand from Paul [who's ears I probably trust more than my own] that Mark did it, but twern't easily done.”
Interesting that, the more I think about it the less of a PITA a ceiling job seems to be and it would have the advantage of keeping more floor space too. The ceiling could come down a little (only a 6” gap between ceiling and top of window though) and this would also have the advantage of making the room not a 8’6” cube. I would expect that less bass trapping would therefore be necessary after installing a lowered ceiling. However, there would be less room for the bass traps so the whole plan could backfire if the amount of trapping required exceeded the now reduced space to put it in.
I would n’t like to predict the results, despite liking the idea with its potential to create a more ergonomic room…..
…….and that rockwool is nasty and itchy stuff to work with so I think I’ll stay with what I have for now.