Again, real-world vs software (formula) prediction analysis often leads us down the garden path... chasing wild geese. Some insights from the largest acoustics laboratory in the world.
John your channel is the number one resource I've found for us home studio musicians and mix engineers who are building rooms... I built a pretty good room, actually two rooms decoupled and both decoupled from my house and have achieved great results... nearest neighbors cant hear me play my drums while inside their house, even with their windows open at the quietest time of night... thanks!
Can you help us explore the flip side? Assume we can build the 62-70 STC walls you've described. How easy is it to ruin that performance by poking a hole of x-diameter in the wall on one side.. on both sides..? This is to explore about how the builder leaving a tiny air gap can nullify a good design. Of course when you're talking about that many layers, it might be more difficult to leave an air gap, but just for sake of discussion. My guess is that it takes very little to undo isolation, because sound PRESSURE finds its way through tiny holes almost as easily as big ones. Is that right?
There's some pretty interesting stuff with 3D printing metamaterials. Where you create subwavelength resonators to absorb certain frequencies and that absorption can be nearly completely smoothed using a thin foam absorber over the top, losing only a couple % absorption coefficient. But it's very new stuff, still being researched
@@JHBrandt Totally fair! I'm pretty much the same, except with me, it's whether it's been peer reviewed or not. Either that or if I know exactly how the testing was undergone, or if I've tested it myself. The research paper I saw on the 3D printed subwavelength resonator was quite thorough. The only issue was that they were using a 1/4 wavelength resonator tube for testing, and therefore only tested acoustics that had 0° incidence to the resonator, so we don't know how it's off-axis performance fairs. Nor do we know its absorption out of their recorded frequency range
Very thanks!
John your channel is the number one resource I've found for us home studio musicians and mix engineers who are building rooms... I built a pretty good room, actually two rooms decoupled and both decoupled from my house and have achieved great results... nearest neighbors cant hear me play my drums while inside their house, even with their windows open at the quietest time of night... thanks!
Can you help us explore the flip side? Assume we can build the 62-70 STC walls you've described. How easy is it to ruin that performance by poking a hole of x-diameter in the wall on one side.. on both sides..? This is to explore about how the builder leaving a tiny air gap can nullify a good design. Of course when you're talking about that many layers, it might be more difficult to leave an air gap, but just for sake of discussion. My guess is that it takes very little to undo isolation, because sound PRESSURE finds its way through tiny holes almost as easily as big ones. Is that right?
There's some pretty interesting stuff with 3D printing metamaterials. Where you create subwavelength resonators to absorb certain frequencies and that absorption can be nearly completely smoothed using a thin foam absorber over the top, losing only a couple % absorption coefficient. But it's very new stuff, still being researched
I do a lot of research but I always hold off talking about new ideas and products until they have tested in a qualified laboratory. ;)
@@JHBrandt Totally fair! I'm pretty much the same, except with me, it's whether it's been peer reviewed or not. Either that or if I know exactly how the testing was undergone, or if I've tested it myself. The research paper I saw on the 3D printed subwavelength resonator was quite thorough. The only issue was that they were using a 1/4 wavelength resonator tube for testing, and therefore only tested acoustics that had 0° incidence to the resonator, so we don't know how it's off-axis performance fairs. Nor do we know its absorption out of their recorded frequency range
@@lio1234234 impedance tube testing... we did a video on that. If it's not up, I'll post it soon. 😁