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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Need advice in DIY absorbing panel posted by Wlad on October 29, 2005 at 09:32:32:
I am sorry that my construction details are not clear enough for you to understand.To directly answer your current questions:
Use the medium density OC703's if that is all that will be in the panel besides the polybatting.Be sure to use the maximum thickness that you can, I recommend all 4".
Be sure to space iot out from the wall at least 2", this can increase the LF absorption quite a bit, and is "for free".In answer to your second posted question, yes, rock wool of that density is OK.
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Now, to try and explain my DIY note instructions:
The DIY Acoust6ics note is/was a work in progress, and one that has evolved some over time.When I first built my own panels years ago, I was looking to achieve maximum LF absorption without adversely affecting the midrange and HF absorption. In order to do this, I used a combination of "high density" rock wool panels glued onto the rear of a wooden frame consisting of 1X2's, and 3 1/2" of building grade kraft faced (the brown paper-like material) fiberglass in front of that, held within the frame by stapling the facing to the inside rear edge of the frame (kraft paper side to the rear), and then a layer of "hi-loft" type polyester batting (roughly 0.5lbs/cu.ft density) over the fiberglass, and then a covering of burlap cloth stretched over the frame to the edges, which was tacked down around the edges of the frame (or on the back) with decorative thumbtacks.
The frame consisted of two sections with 15" side-to-side center spacing for the two segments, as this is the width of the common building grade fiberglass that comes in rolls here is the US. That makes for a total of about a 31 1/2" wide finished panel, and a recommended minimum height of 48".This construction and specific assembly worked well, but with the difficulty I had later on obtaining the high density rock wool panels (roughly equivalent to the OC705 type panels), I tried out alternative constructions, and found that if you used a layer of 6 or 6 1/2' thick building grade fiberglass in the now 1"X4" frame, without the rock wool panels, it still worked pretty good, it was just a little thicker.
Actual thickness differences were:
original panel - almost 3" at the edges, and about 4" in the middle of the frame.
second version - about 4 1/8" at the edges, and about 5" or so in the middle of the frame.Later on, I tried a panel with nominally 8" thick building grade fiberglass, in a 1X6 frame, and this worked even better than the first two.
The biggest penalty was that when these panels were spaced away from the wall about 2-3" (which maximizes their LF absorption), the overall thickness of the later two versions of the panels is getting pretty deep, or conversely, is sticking out from the wall quite a bit.
One of the things I was trying to do with the later versions was to avoid the use of the semi-rigid panels: they are generally harder to get than building grade fiberglass, and cost more too.
I hope that this helps explain the construction of the DIY wall panels a little better.
Jon Risch
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Follow Ups
- Re: Need advice in DIY absorbing panel - Jon Risch 10/30/0518:43:52 10/30/05 (0)
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