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Post by askthepro on Nov 29, 2016 8:48:27 GMT
Hello! I have an eye on the exact material that I can get for an awesome price. It's basically SL 930/RW3, but with a Glass Silk lining on one side. Here's the page to the shop store: www.eurovent-sistemi.hr/proizvod/techrock-60sb-1What would be the effect of the said lining on the acoustics of the room? Would it act as a membrane and reflect back frequencies above 2 kHz? According to the store manager I talked to, they can be easily peeled off if necessary. If they do reflect frequencies, where would I want to leave them? My room sounds pretty natural without any treatment (clapping results in a nice, diffused and soft reverb, compared to the other rooms, probably due to the wall finish), so do I want it at all? Not related to acoustics directly, but if I can get this answer here it would be tremendous help: can this be used for soundproofing and will 50mm do the job, and what kind of job will it do? Thank you very much.
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Post by Hexspa on Nov 29, 2016 12:05:39 GMT
afaik glass silk is fiberglass.
Those panels look thin.
-m
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Post by rock on Nov 29, 2016 13:09:47 GMT
That covering may be acoustically transparent. Can you get the acoustic spec sheet for this product? Or use the talk test with a known wide band absorber. That will give you a clue.
Acoustic treatment is controlling sound in a room, soundproofing is controlling transmission of sound from room to room. Completely different techniques are used for each.
Please read Ethan's sticky and Hexspa's ebook.
Cheers, Rock
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Post by askthepro on Nov 30, 2016 14:48:56 GMT
Alright thanks. I'll dive into those. Best I can find is this: www.siper-bg.com/files/products/pic479_1_en.pdfI'm just curious whether the black fiberglass lining will help me or screw me over. They are thin, and I would stack them to achieve desired thickness, which is why I'm worrying about what the black fiberglass lining will do.
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Post by rock on Nov 30, 2016 22:39:24 GMT
If you look at Ethan's and Hexspa's videos too, you'll learn a lot and get some good tips. I suggest reading and watching the videos first so you can make a plan.
The question you need to ask is "Is the black fiberglass acoustically transparent?" If it is (sound passes through it) it is OK to sandwich them together. If it is acoustically reflective, it may be fine for the front side of a corner bass trap but not on the inside or back. Like I said before, use the talk test: since the back is raw rockwool and the front is covered, talk into the back and notice the absorption of your voice. Turn the panel around and talk into the black fiberglass side, if it sounds the same as the back, the black fiberglass stuff is transparent, if it sounds more like you are talking into a hard wall, it's not. If you can rip a piece of the black stuff off and blow through it, it's probably mostly transparent.
Cheers, Rock
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Post by Hexspa on Dec 1, 2016 19:11:53 GMT
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Post by rock on Dec 2, 2016 2:31:30 GMT
Hi askthepro,
If I did not suggest, I think you should ask the manufacturer directly. That black covering is obviously there for a reason and I suspect it's there for cosmetic reasons and to be exposed to the room. Simply ask them what the acoustic properties are and for that matter, if the intended purpose is what I suspect or something else.
I should also mention that I am a member on this forum just like you, I am not the expert. I have read much of Ethan's material and agree with it and I freely express my (hopefully correct) interpretation of the basic principles Ethan has put forth, which are backed up by practical, repeatable tests. Also, as Ethan has mentioned, this site exists to provide support for his company "Real Traps" but also to provide information to DIY'ers like you and me. Questions about products from other manufactures should more appropriately be asked of them.
Cheers, Rock
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Post by Hexspa on Dec 2, 2016 11:28:23 GMT
Or just buy stuff everyone knows works.
Newbs should always follow the plan.
-m
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Post by askthepro on Dec 2, 2016 23:45:52 GMT
Thank you both very much for your kindness and help. The material is transparent and according to the manufacturer serves "to maximize high end absorption when using thinner slabs", although I'm not sure how much does it exactly improve performance.
Also thank you hexspa for providing the links to the videos and the ebook. I'm watching them right now and will definitely give the book a read.
I think I'll go with this since I can get it at $5 per m2 and can basically get the required amount for less than $150. Worst case scenario, I can always remove the black lining and still have the proven-to-work SL 930 left.
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Post by Hexspa on Dec 3, 2016 10:36:28 GMT
Thank you both very much for your kindness and help. The material is transparent and according to the manufacturer serves "to maximize high end absorption when using thinner slabs", although I'm not sure how much does it exactly improve performance. Also thank you hexspa for providing the links to the videos and the ebook. I'm watching them right now and will definitely give the book a read. I think I'll go with this since I can get it at $5 per m2 and can basically get the required amount for less than $150. Worst case scenario, I can always remove the black lining and still have the proven-to-work SL 930 left. Thank you! Have fun with the wild world of acoustics
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