It's the same as OC basically, just more simple productline. I used a Scandinavian manufacturer, Isover, their 'Piano' slabs. Can't imagine what it would've taken me to do the whole ceiling. I made my traps by myself with household tools, took me 2½ days. I put my triangular traps in the corners only. I don't know, but could it possibly be better to use a slightly more firm fiberglass for such a large surface? Because it's going to do alot more than just kill the room modes. 4" is fine if you use enough of it - the whole ceiling is covered, with a 4" air gap above.Wow, you covered the whole ceiling? Some job :) Assume that will give you very good absorption overall, unless there are still some modes left due to 90 degree angles in corners here and there. I would say he's more a fan of broadband absorption (which he sells) for smaller rooms, and offers diffusors for larger rooms. It was used for RFZ, and various other mid/high damping panels, about a dozen in total carefully placed on the walls. I used 1" (forget the brand) it was about 0.75 (75%) at 500 Hz, spaced 1" from the wall. We were lucky to get the room tuned to +/- 5db 20Hz - 20 KHz at the mix position, very happy with the results, it's a pleasure to mix here.ĭid you measure your final result, how did it turn out ? The room measures out well using REW (Room EQ Wizard), so I would say 4" is fine if you use enough of it - the whole ceiling is covered, with a 4" air gap above the OFI 48. I used 4" Ottawa Fibre OFI 48 (roughly equivalent to OC 703), it's about 0.55 (55%) at 80 Hz. Diffusors won't kill room resonances, but it will diffuse/disperse them. His makes and sells his own diffusors even. Since Ethan Winer is mentioned, he knows alot but understand he's a big believer in diffusion over absorption. Buying those readymade sometimes cost 10 times the price compared to DIY. Hammer together a wooden frame around the fiberglass slab, dress the whole thing with dense fabric and staple it into the frame. Place them with a gap between them and the wall. Kill the room modes and the overtones will go too - oversimplified.Īs for other panels made to catch 500hz and upwards, those you can make 4 inches thick. ![]() The higher resonances are basically overtones off of the room modes. They are by far the most important one's to kill. The bass freqs are the fundamental room modes. But those you got has got much higher density still, so say 300hz. At ~6kpa/m2, you probably wouldn't notice any difference below 200hz. And if they catch too much treble with it, you put kraft paper on the front side of them, to reflect off some higher freqs.Ĥ inches thick, won't kill off much bass at all. I built 60cm deep ones in all 4 corners, 2½ meters high. A common theory is to catch half the wavelength on the way towards the wall, and catch the other half once (whatever is left) it reflects back off of the wall (from behind the trap). Low freq wavelengths are loooong, and if you're going to catch those you need traps with some size. Make sure triangular traps run all the way from the floor to the very ceiling. 4 inch bass traps will give you 70% absorption at 400hz, only 10% absorption at 50hz. No good.įor bass absorption, aim for 70% absorption at 50hz. R13 I believe is about twice that density, and so are the OC 703. Owen's Corning Pink fluffy R21 got that density. Very little bass.įor triangular bass traps, use as low density material you can possibly find. I say 4 inches bass traps will remove mostly treble. If you use very thick pink (and have the space and place to put it) it can be reasonably effective, you don't need as much of an air gap here because the material is so thick, but if you can get an air gap, do utilize it. Can't absorb sound unless the air is moving - air gap - very important. The air right at the wall isn't moving, just like when a pool ball hits the rail it is, for an instant, stationary. ![]() This means there is definitely a "sweet spot" - too little resistance and not enough sound is absorbed because too much passes through - too much resistance and not enough sound is absorbed because too much is reflected back.ĭon't forget to leave an air gap (about the same thickness as your material), because in order for this whole gas flow resistivity thing to work, the air must be flowing. The little honeycombs (and other nest type structures) resist the sound wave and this generates friction causing heat, and thereby reduces the sound wave magnitude. These products work by changing the sound wave energy into heat. Yup, it's all about something called gas flow resistivity (resistance). ![]() I don't know how accurate this is, going to use it as a starting point
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