CIGARBUM Posted February 12, 2009 Share Posted February 12, 2009 What is the prefered material to damp the inside of the Cornscala's I'm building. I know there was a thread somewhere but can't find it. Then, what is the prefered method of attachment. Is the material available on the web anywhere? Thanks CB Quote Link to comment Share on other sites More sharing options...
USNRET Posted February 12, 2009 Share Posted February 12, 2009 eh, peel the label off the scotch bottle, damp (dampen, increase wetness, whatever) with cigar butt saliva and stick to wall of speaker. Inside/outside your choice. Several layers improve the sound or decrease your attention to detail. Wanta ride to TN? Sorry, can't help except with the material used to damp car body interiors. Quote Link to comment Share on other sites More sharing options...
Groomlakearea51 Posted February 13, 2009 Share Posted February 13, 2009 R-11 insulation, stapled, will work. The closest to the original brown kraft paper "batting" would be: S-7074 (indented Kraft paper) which you would "stack" and staple in the same number for thickness as in the Cornwall cabinets. Alternate is S-1556 or S-656 which is almost identical to the factory batting. Look also at S-3576 and S-666, etc. www.uline.com They also have the really, really good stuff for packing and shipping speakers.... Quote Link to comment Share on other sites More sharing options...
CIGARBUM Posted February 13, 2009 Author Share Posted February 13, 2009 How about the 1" poly fiber stuff from walmart? Glues or stapled? Quote Link to comment Share on other sites More sharing options...
Groomlakearea51 Posted February 13, 2009 Share Posted February 13, 2009 I'd staple the stuff with one of those staple guns from walmart that uses the "T-50" staples. Reason? You can remove it easily if it does not sound right, or you want to add/ subtract more of it, etc. Li' staple holes are inconsequential compared to the glue "mess" that would result on removal, etc. Quote Link to comment Share on other sites More sharing options...
Edgy Posted February 13, 2009 Share Posted February 13, 2009 I used this stuff, and really like it. It's easy to cut and the peel and stick back make it easy to apply. http://www.parts-express.com/pe/showdetl.cfm?Partnumber=260-530 Funny thing is, Parts Express has it in their "cabinet dampening material" section... Quote Link to comment Share on other sites More sharing options...
CIGARBUM Posted February 13, 2009 Author Share Posted February 13, 2009 I'm sure it is a very good product, the only problem is that to line the inside of both bass bins I need about 18 sheets = Approx. $300. Got to be a cheaper way. Quote Link to comment Share on other sites More sharing options...
Groomlakearea51 Posted February 13, 2009 Share Posted February 13, 2009 I'd try some R-11, R-13 type stuff to start with just to keep the "experiment" on the cheap side before going after the kraft paper or more expensive "audiophile" fill. I'm not sure about poly-fill. Send DrWho an email and ask him about that "area". Also, what does Bob Crites use in his? Quote Link to comment Share on other sites More sharing options...
CIGARBUM Posted February 13, 2009 Author Share Posted February 13, 2009 I think that Bob uses carpet padding in his box Quote Link to comment Share on other sites More sharing options...
BEC Posted February 13, 2009 Share Posted February 13, 2009 I did that for one. Was going to see if I liked it compared to the other one with nothing in it. I could not tell any difference, so never did the other one. Now I have forgotten which one has the padding. Bob Quote Link to comment Share on other sites More sharing options...
kg4guy Posted February 13, 2009 Share Posted February 13, 2009 I am in the middle of starting my Cornscala build and wasn't sure on what to use for the inside of the cabinets but if there is little difference than I will not worry about it. Thanks.[*-)] Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted February 13, 2009 Share Posted February 13, 2009 Klipsch generally uses a 1" grey medium density open cell foam, non-convoluted. They have been using this material across the board for many years now. The idea is just to reduce standing waves inside the cabinet which can be achieved by lining one of each of two parallel sides. That is all that is necessary. Over-stuffing is not helpful. Quote Link to comment Share on other sites More sharing options...
kg4guy Posted February 13, 2009 Share Posted February 13, 2009 Thanks Mike I will go with that. Quote Link to comment Share on other sites More sharing options...
CIGARBUM Posted February 13, 2009 Author Share Posted February 13, 2009 Where do you get the material, the stuff you said convoluted something. is it cheap like fiber fil?? Thanks Mike CB Quote Link to comment Share on other sites More sharing options...
USNRET Posted February 13, 2009 Share Posted February 13, 2009 I'm not the Mike you asked but I've used these products in my hotrods over the years. Not cheap but look around the site. http://www.dynamat.com/products_intro.html Quote Link to comment Share on other sites More sharing options...
Edgy Posted February 13, 2009 Share Posted February 13, 2009 I'm sure it is a very good product, the only problem is that to line the inside of both bass bins I need about 18 sheets = Approx. $300. Got to be a cheaper way. I've seen the picture of your "redneck" audio system. You got enough high dollar gear to fuel ebay for a day. Cough it up! Quote Link to comment Share on other sites More sharing options...
Groomlakearea51 Posted February 14, 2009 Share Posted February 14, 2009 Where do you get the material, the stuff you said convoluted something. is it cheap like fiber fil?? Thanks Mike CB CB, it's just like what we would call "foam rubber"; if you have access to a pair of Heresy-II's, it's the same material they use folded over the woofer. Open cell means that it "breathes". A store that sells mattresses would also have it as a "mattress pad", but will have the funny bumps on one side (no effect). El cheapo "camping pads" at walmart are also similar and would work. Quote Link to comment Share on other sites More sharing options...
HDBRbuilder Posted February 14, 2009 Share Posted February 14, 2009 I'm sure it is a very good product, the only problem is that to line the inside of both bass bins I need about 18 sheets = Approx. $300. Got to be a cheaper way. The cheapest way I know of is to find a restaurant which uses lots of eggs, and gets its eggs by the flats, with the flats being the paper type material..take those flats and staple them inside the cabinets. Works just fine. Ever try using the blanket insulation used by siding companies to wrap a house before they install the siding? That works too...always lots of scraps around the job sites..you picking them up saves them from having to do it themselves. There is ALWAYS a cheap alternative! Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted February 14, 2009 Share Posted February 14, 2009 you can use the inexpensive convoluted (egg crate-looking stuff) foam that PE sells. I'd get the thicker stuff, you want about 1"nominal thicknes. Quote Link to comment Share on other sites More sharing options...
Edgy Posted February 14, 2009 Share Posted February 14, 2009 Dickason did some pretty exhaustive testing in the Loudspeaker Design Cookbook, and that egg crate stuff is pretty much useless. If you want to damp(en) the walls, you need something with layers, like the sound barrier stuff I used. If you are concerned with interior reflections, good old 1" fiberglass is hard to beat, but messy, of course. There is a material made by Owens-Corning they call #705 that is a stiff 1" fiberglass material made for insulating. Koonce and Wright used it in a subwoofer they built for Audio Express a few years ago, and reported very good results. They remarked that the same material is used in some very high end speakers. I called around looking for it, and found a supplier locally, because I'm intending to replicate their sub. Quote Link to comment Share on other sites More sharing options...
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