42mb
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Posts: 12 
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Post by 42mb on Mar 6, 2017 19:31:32 GMT
Hello,
I am looking to add some bass traps and reflection panels to my home theater. I've done a lot of reading in regards to Ethan's articles about this subject. Just looking for some clarification regarding materials and my plan.
The plan;
The Owens Corning 703/705 etc is not available in my area.
Plan on using Roxul.
My front corner traps 3" will placed in an "L" configuration as per Ethan's article. they will be spaced 3-5 inches from the wall Rear traps will straddle the corners. traps will be floor to ceiling.
I plan to add some trapping to the ceiling (suspended) and wall perimeter. I read that simply laying insulation on top the ceiling grid at the walls would work.
first reflection panels for speakers will spaced off the walls 2-3 inches.
Questions;
What insulation would be recommended for this to work properly?
I have access to Roxul safe and sound 3" and Roxul Comfortboard IS 1.5" Roxul SS is rated @ 0.52 @ 125Hz and the Comfortboard is 0.75 ( 3 inches, 2 pieces) @ 125Hz
Would the pink fluffy R38 stuff be better for the on top of the ceiling grid?
Thanks for your response! |
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42mb
New Member
Posts: 12
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Post by 42mb on Mar 9, 2017 1:02:16 GMT
Any ideas??
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Post by Hexspa on Mar 9, 2017 15:15:34 GMT
Hello,
I am looking to add some bass traps and reflection panels to my home theater. I've done a lot of reading in regards to Ethan's articles about this subject. Just looking for some clarification regarding materials and my plan.
The plan;
The Owens Corning 703/705 etc is not available in my area.
Plan on using Roxul.
My front corner traps 3" will placed in an "L" configuration as per Ethan's article. they will be spaced 3-5 inches from the wall Rear traps will straddle the corners. traps will be floor to ceiling.
I plan to add some trapping to the ceiling (suspended) and wall perimeter. I read that simply laying insulation on top the ceiling grid at the walls would work.
first reflection panels for speakers will spaced off the walls 2-3 inches.
Questions;
What insulation would be recommended for this to work properly?
I have access to Roxul safe and sound 3" and Roxul Comfortboard IS 1.5" Roxul SS is rated @ 0.52 @ 125Hz and the Comfortboard is 0.75 ( 3 inches, 2 pieces) @ 125Hz
Would the pink fluffy R38 stuff be better for the on top of the ceiling grid?
Thanks for your response! Hi 42. My front corner traps 3" will placed in an "L" configuration as per Ethan's article. they will be spaced 3-5 inches from the wallI'm unfamiliar with this "L" configuration. Can you post the link or an image? Secondly, I don't recommend 3". I know your choices are 3" and 1.5" but I would go 6" if given the choice. If you decide to go 3" then please be sure to get a good percentage of surface coverage, use an air gap, membrane and possibly fill the air gap with fluffy. I plan to add some trapping to the ceiling (suspended) and wall perimeter. I read that simply laying insulation on top the ceiling grid at the walls would work.
Again, I'm not as familiar as others on this forum with construction. Do you mean you have a ceiling that is air permeable and you want to treat the corners that way? Sounds good. While your at it try to treat the whole ceiling. first reflection panels for speakers will spaced off the walls 2-3 inches.
Again, not bad but it's better to think in terms of multiples of the thickness of the panel itself. Anywhere from 1x-4x is recommended. There are no penalties for using another metric but it does make you think in terms of larger values. Especially if you're only going to use 3" panels, you'll need as much air gap as possible to have as much of an effect on the low end. What insulation would be recommended for this to work properly?Either is fine. Safe n Sound Absorption Coefficients (p11)
Comfortboard Absorption Coefficients Bob Gold's List (The above Roxul samples compare closely to similar density and thickness 70X)The difference is mostly at 250Hz - adding more panels will compensate. Would the pink fluffy R38 stuff be better for the on top of the ceiling grid?
Probably. It's lighter and you can make it thicker for less. So if you're hard and fast about using only 3" panels from the ceiling down, you can compensate to a degree by using thicker insulation up top. Thanks for your response!
Thanks for your question. -m |
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42mb
New Member
Posts: 12
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Post by 42mb on Mar 9, 2017 19:55:19 GMT
Hi Hexspa, Thanks for the info. the link below references the corner L shapes trap I mentioned. audioundone.com/do-it-yourself-bass-Can I cover the pink stuff up if I put in the corners. Thinking of plastic just to contain the fibers etc or is the plastic too restrictive. If I go to 6" panels versus 3" will the absorption Coefficients double? What is more important for selecting trap material, thickness or density? In other words would 12" of fluffy (less dense) perform as good as 6" of roxul (more dense)? The ceiling is a dropped grid style with fiberglass 2 x 4 tiles. Thinking the fluffy would be better as you indicated due to its weight and thickness |
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Post by rock on Mar 9, 2017 20:45:23 GMT
With the "L" config, you'll use double the material but if you can't straddle the corner, it will work and as Ethan points out, it will not reflect mid/hi back into the room.
6" vs 3" will absorb down one octave.
42mb wrote: "What is more important for selecting trap material, thickness or density? In other words would 12" of fluffy (less dense) perform as good as 6" of roxul (more dense)?"
Probably and maybe better. My understanding is more like: 6" of Roxul will perform somewhat better than 6" fluffy. 12" of Roxul will only perform slightly, if any better than 12" fluffy. Thicker, even less difference.
I think the way to look at thickness is: Once you go more than 6" - 8" the high density will make less and less of a difference so the general advice is over 8" use fluffy, mainly for lower cost since spending more for the same thickness of hi density will only slightly better performance, if any at all.
Cheers,
Rock
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Post by Hexspa on Mar 10, 2017 3:16:22 GMT
With the "L" config, you'll use double the material but if you can't straddle the corner, it will work and as Ethan points out, it will not reflect mid/hi back into the room. 6" vs 3" will absorb down one octave. 42mb wrote: "What is more important for selecting trap material, thickness or density? In other words would 12" of fluffy (less dense) perform as good as 6" of roxul (more dense)?" Probably and maybe better. My understanding is more like: 6" of Roxul will perform somewhat better than 6" fluffy. 12" of Roxul will only perform slightly, if any better than 12" fluffy. Thicker, even less difference. I think the way to look at thickness is: Once you go more than 6" - 8" the high density will make less and less of a difference so the general advice is over 8" use fluffy, mainly for lower cost since spending more for the same thickness of hi density will only slightly better performance, if any at all. Cheers, Rock Rock, you're the pink fluffy to my air gap. Still trying to figure out if I'm paper or scissors... -m |
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42mb
New Member
Posts: 12
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Post by 42mb on Mar 10, 2017 14:49:59 GMT
Thanks Rock,
Fluffy........can it be in plastic and then placed behind the traps...
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42mb
New Member
Posts: 12
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Post by 42mb on Mar 13, 2017 16:48:07 GMT
Few more questions;
What is the purpose of the paper or plastic membrane facing the room?
Reflect higher frequencies?
I have some fiberglass 2 x 4 ceiling tiles that have a very thin white membrane on them. Was thinking of installing this into the frame first with the white membrane facing the room then layer in 6" of Roxul safe/Sound.
Does this make sense?
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Post by Ethan Winer on Mar 16, 2017 16:12:49 GMT
A thin reflective surface reflects highs, and can also improve bass absorption if it's bonded to the rigid insulation.
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42mb
New Member
Posts: 12
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Post by 42mb on Mar 17, 2017 0:36:49 GMT
Thanks Ethan,
Would it then be a good idea to go this route for my corner traps?
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Post by Hexspa on Mar 17, 2017 20:04:46 GMT
Thanks Ethan, Would it then be a good idea to go this route for my corner traps? FRK? Yes. I only treated half my super chunks and I'll probably go back and fully face them. |
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42mb
New Member
Posts: 12
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Post by 42mb on Mar 21, 2017 1:09:25 GMT
Could I use Kraft paper spray glued to the first layer of Roxul.....
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Post by Hexspa on Mar 21, 2017 4:51:59 GMT
Could I use Kraft paper spray glued to the first layer of Roxul..... Forgive me if I don't include the full context of the thread but..... Glue kraft paper to the surface of the absorption facing the room. -m |
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42mb
New Member
Posts: 12
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Post by 42mb on Mar 29, 2017 19:21:33 GMT
Could I use Kraft paper spray glued to the first layer of Roxul..... Forgive me if I don't include the full context of the thread but..... Glue kraft paper to the surface of the absorption facing the room. -m
Thanks. I have some spray adhesive that should work fine. It may be a bit tricky getting the paper smooth but I'll give it a go.
First Reflections:
I've located my ceiling points that need to be treated. I have a dropped grid ceiling that uses the 5/8 thick fiberglass 2x4 tiles that have a thin white membrane attached to one side.
My plan is to remove the white membrane to expose the fiberglass and then glue some fabric to the tile. I Can then reinstall the tile in the ceiling and lay fluffy insulation over the tile giving it more absorption thickness.
does anyone see any pitfalls to this idea?
Thanks
42mb
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Post by Hexspa on Mar 30, 2017 2:51:12 GMT
Forgive me if I don't include the full context of the thread but..... Glue kraft paper to the surface of the absorption facing the room. -m
Thanks. I have some spray adhesive that should work fine. It may be a bit tricky getting the paper smooth but I'll give it a go.
First Reflections:
I've located my ceiling points that need to be treated. I have a dropped grid ceiling that uses the 5/8 thick fiberglass 2x4 tiles that have a thin white membrane attached to one side.
My plan is to remove the white membrane to expose the fiberglass and then glue some fabric to the tile. I Can then reinstall the tile in the ceiling and lay fluffy insulation over the tile giving it more absorption thickness.
does anyone see any pitfalls to this idea?
Thanks
42mb
By "over the tile" do you mean in front of (as in room side) or behind (as in in the ceiling?) Layering different materials is usually done by having the rigid facing the room with fluffy behind. -m |
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