Thomas Jouanjean wrote on Thu, 04 December 2008 07:29 |
brett wrote on Wed, 03 December 2008 17:56 | I read on RPG's web site, no matter how thick you go there isbn't enough air movement in the corners to absorb the energy using fiber panels at these freq. And tuned is the only way to do it. Your thoughts?
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What you need in your room is a mix of both resistance to flow treatment (rockwool) and tuned membrane systems (free membranes, not glued to the rockwool). You need to interface them with air cavities.
Start with your backwall now. This is where you really need to do something now.
Treating your back wall and corners is more important than any treatment on the front wall or ceiling.
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My buddy said the same thing last night. Before he opened up his current place, he was mixing in a residential bedroom and he did the entire rear wall 4' thick with fiberglass. That isn't going to happen in my room. It is a loft. The rear wall is partialy open to the living room below and there is a wardrobe on the right that I need. And A murphy bed on the rear wall that I sleep on.
I'll do what I can on the rear wall. I need some instruction on membrane construction and tuning and placement. I have a general idea, but is there a calculator for tuning a membrane resonator. I found one for Helmholtz but a helmholts at 70hz is 10" deep with 2x10 slats. Would weigh a freeking ton! I would like to make four membrane boxes like the RPG modex corners and place them in the four corners on the floor. Then I plan to do the entire rear and front wall conrers in 6". That is about all I have room for.
I also can add some limp mass foil to the broadband absorbers. That may help with the 250hz null.
Another idea is to have a drywall guy come in and do the ceiling with 1/4 plywood. Then reshoot with popcorn. The landlord would never know and the entire ceiling would be absorbant down to 70hz. I could load the cavities with ridgid glass or double or triple pack it with compressed r30 batts. Any thoughts on this?