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If I use 2 inch thickness of fiberglass panel with 3pcf for backing. Do I still need an additional of 6-1/2 of fiber glass insulation or I can get away with an additional 3-1/2 inch.Also since my ceiling is 12 ft tall and I want to cover it with 6ft absorbing panels (can I get away with 4 ft? I have Martin Logan Sequel II). However most of the panles come with 2'x4'. If I cut this in half to make a 2'x6' panels, do I need to seal the seam between the panels where they joint together?
By the way my local store have the brand called Certainty that they said equivalent to Corning 700 series. Have you heard about this brand? Thanks
P.S. After I built your Power Conditioner, at least three of my friends followed my footstep. Next time I will try to add the balance transformer to the filter per your DIY. Does anyone add the balance transformer after the filter yet? What's their impression about it?
Follow Ups:
The original design used the rock wool/OC panels to increase bass absorption while minimizing thickness. They were based on a 1" thick panel.If you usea at least 6 to 6 1/2" fiberglass, then this is adequate to absorb enough bass to prevent tonal balance irregualrites.
Thickness comparison:
A sound absorbing wall panel assembly with a 2" rear panel and 3 1/2" fiberglass, in a 1X4 frame will puff out to about 5-6" thickness or so in the middle, depending on how tightly the burlap is stretched.
Remember, we have: a 2" thick panel that is NOT going to compress at all, a sheet of poly batting to prevent the paper backing from flapping against the hard panel, then 3 1/2" of faced fiberglass, then a complete layer of poly battting (this runs 1/2" to 3/4"), then some burlap or speaker grille cloth.For the version with just 6" to 6 1/2" of fiberglass (no rock wool/OC panel), we have: the 6" of fiberglass, a layer of poly batting, then the outer cloth. Total thickness is around the same. Cost will be less than the first version, and it wil perform as well. The version built using the 1" rock wool/OC panels was a little thinner, and performed about the same as the 6" fiberglass only version.
The width really needs ot be more than 24", I call out a minimum of 30", so placing the panels on end, and stacking three will avoid any cutting. Sealing them is optional, and really does not make much difference.
Certainteed may have an equivalent, I ws not aware of these. They are fairly basic: fiberglass with a resin impregnation to render the panel/board stiff. The main thing is to match the density as recommended.
Jon Risch
If I use the panels on both of the side walls and using the roomlens as a diffusor on the back wall (behind listener), is this OK or this combination will degrade the sound. Thanks, again.
Combining different treatmentys often can be synergistic.
I know the Room lens people advise against it, but there is no "wrong" way to mix and match until it works in your room, for you on your system!Jon Risch
finally...I've found a site that might have answers for me. I am interested in knowing the absorbtion characteristics of good old owens "pink" insulation. How does it compare to the rigid fiber glas products that are used in the over-priced prefab panels for sale by companies such as auralex, RPG, sonex etc ? In short.. is there a cheap/er way for me to cover large areas in my new studio facility where the large dimensions (the tracking room is 50 by 36 whereas the control room where I am doing my monitoring is approx. 25 by 36) make surface treatment an expensive proposition. The tracking room is carpeted but still way to "live" a flutter or slap back echo is very audible when clapping your hands,, for example. I need an economic approach to "absorbtion" and know some panels would be in order. sorry for the long-windedness here but I would greatly appreciate any resposes. Thanks mucho much! mr.b
The absorption characteristics can be found at the OC web site, or at one of the other manufactuer's of fiberglass (they are all prety much the same of a given thickness).For info on DIY Acoustic Treatments, see:
http://www.geocities.com/jonrisch/a.htm
AND
http://www.geocities.com/jonrisch/a4.htmincluding the original DIY Acoustics note from me:
http://www.geocities.com/jonrisch/a1.htmJon Risch
What a nice size room. Are you looking into employing diffusers too?
I hope so, as it would be a shame to deaden a room like that too much.
What type of music are you tracking? What type/height of ceiling does the room have.Here's some recording studio acoustics links.
http://www.studiotips.com/
http://groups.yahoo.com/group/acoustics
http://hem.passagen.se/akustik/index.html
http://forums.delphi.com/n/mb/message.asp?webtag=recaudiopro&msg=11.1
the ceilings are 10' 8'' and covered in what looks like an old treatment of some kind of "acoustical" spray (has a cottage cheese appearance).I am excited about the generous size of the rooms...but as we speak they are way too reflective. Apparently the walls are cement block with one thin layer 1/2 sheetrock nailed to them. I've been trying to determine a reasonably economic means to approach this project....and am excited about stumbling on to this forum. I have been the main recording studio in a relatively small town for the last twenty years and therefore find myself tracking everything there is to track: fourty piece stage jazz bands, Mariachi bands, every kind of rock bamd, classical violinists, acoustic folk ensembles, bluegrass, country, rappers....you name it. As the only game in town I've had to wear many hats. Now, I've finally moved into a legitimate building (at least dimensionaly if not acousticaly) and I want do what I can to make it right. AS always "dinero" plays a major role. I've been doing a lot of reading and, quite frankly, a lot of what I read is over my haed. I don't have a degree in the science of acoustics, nor the physics of sound. But, I'm game and I'll keep digging. This site just might prove to be a gold mine> I bought the matewrials to build a couple of Jon's panels already. Thanks for your kind responses and interest. All of this is much appreciated. I'm not sure I have much technical expertise to offer up as a way of contributuing back to your community.
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