5/26/2023 0 Comments Mass loaded vinyl vs dynamat![]() ![]() Now the cheaper stuff has an alloy top for extra heat resistance which is good, and that final pic looks a little rough due to a blunt knife. And after digging I found this supplier of what I think is exactly if not a little better than the expensive. But I can confirm it is butyl and not bitumen.Īfter finding the waterproof foam from body builders I knew what I was looking for. I did a lot of research and found 2 very well priced suppliers.ĭynamat is roughly from $200-300 for 3.5m2, and there are a few others which are a little cheaper, but this deal is awesome. Well as some of you might have seen I have received my gear to carry out this project.Īnd you may have seen I didn't get brand name. PS, It also keeps the heat out and increases the cold air performance from the air-con. This product has really cut the sound level down. I used a sound deadening mat from Clark rubber, it cost me between $250.00 to $300.00 for memory. Use screws into the body of your MDF box as fixtures, so you can attach cable ties or wire around them, this will allow you to pull the outer piece of chicken wire toward the chicken wire on the box, and so compress the test product that is sandwiched between them, but still allow sound to pass.ĭid you just have speaker playing music? Or did you play a propper dB? Simulated compressing of a soft product ,can be done by sandwiching the product between chicken wire (or steel mesh etc), if you fix chicken wire across the open test end of your bare box for "all" testing, all you need to do is use another peice of chicken wire over the outside, to now compress the test product. This can allow you to "hot swap" different products fast and easy in a semi controlled enviroment (well compare apples with apples anyway), and while not studio accurate, its much better than swapping it on the car to find out/guess, plus you only need small samples to test each product. Place a hifi speaker at a set distance on the opposite end to the db meter (so now the sound has to travel through the test product to get to the db meter) play a set track/recording through the speaker ,play sounds with frequency/s around what you expect to encounter (you could record the car noise you wish to reduce). Westy you figure out someway we an benchmark/test it hahaĭuring my home cinema design/testing, i needed to test sound insulation, so i built a MDF box with open sides at opposite ends, (a square tube in otherwords), attach/suspend a db meter to one end, then cover the other end with the test product. So I my friends will be probably bypassing the dynamat, and going a different option. MLV and lead sheeting have resonant frequencies below the the audible range. High mass and low stiffness mean a low resonant frequency. Low mass/high stiffness mean high resonant frequency. A material's resonant frequency is determined by its mass, stiffness and geometric. Mass loaded vinyl is dense and limp - the ideal characteristics for a barrier. MLV is the answer to the question: "How inexpensively can we create a substitute for lead sheeting that will accomplish the same thing"? ![]() It's the barrier layer that makes the most difference. So the sound waves pass right threw like it was sheet metal. The idea if 100% coverage has come from aftermarket auto lines. So for these products to be at full effect you only need a panel surface coverage of 24%. Products like dynamat and fatmat are sound dampening products, not sound blocking / absorbing. Just to cap the link as it is quite long. It's an interesting read, and has possible saved me hundreds. Well a pull up on the reigns after parksy informed me of an issue I have been reading. ![]()
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