In , Stix produced the first Red Hot Chili Peppers demo recording that led the band to its first recording contract. WEA Latina. By , Spit was writing jingles for Bang Music, engineering, producing, licensing, IT servicing, teaching Logic Pro software privately, and demonstrating for software and digital audio hardware manufacturers at trade shows. He has lived in the Pacific Northwest since where he teaches and performs.
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Developers Blog About Terms of use. Design by Pixelshell. Some Rights Reserved. Finally, for the ultimate in broadband diffusion, fractal diffusers that diffuse over the full audio band are popular in high fidelity listening environments where some liveliness is desired such as RFZ style control rooms.
They let you control reflections throughout the audible spectrum without sucking precious high frequency energy out of your room.
Hi Tim, Real newbie question here … I enjoy hi-fi but have not done much by way of treating my lounge except to have curtains behind the speakers. How would the sound change if I did a complete wall behind the listening position with one of your diffusers? Thanks, Zane. How far is your listening position from the rear wall? That will impact how the diffusers effect your sound. Unfortunately I have a small room — Does it sound like being in a hall or similar? Thanks for your help. They absorb a bit of sound but the primary function of a diffuser is to scatter the sound evenly in your room.
Instead of absorbing all reflections, which can render your room dead, this way you can control reflections while retaining some natural liveliness in your room. Like your rear wall is further away. Widespread diffusion can actually make a room sound bigger than it is. It will also reduce comb filtering from your rear wall, which you may notice as an increase in clarity. I am not sure the wife will be happy with very deep diffusers, do you think an array of the 5cm deep diffusers will be effective?
Or, just thick broadband absorption without diffusers. Perhaps the ideal low profile option for your room is hybrid surfaces like RPG BAD panels, which provide a combination of absorption and high frequency diffusion. Hi Tim, I like your diffuser designs and so will work towards a 5 panel profiled diffuser.
Thanks Zane. Thanks for letting me know. If you get repeat emails let me know and I can pause it for you. Hey Tim! Now here comes the question that might cause both of us to scratch our heads a bit. What if I were to take different diameter pieces of PVC pipe and rip them in half lengthwise, then build a diffuser from them?
Each step would also, as a result, have a different width and depth. Off the top of your head, without Reflex, do you think that would work for both time and space diffusion? Surfaces made from larger poly-cylindrical diffusers of variable size are a good option for large rooms.
One issue with using smaller semi-cylinders is the diffusion bandwidth. If you want to scatter mid frequencies, not just high frequencies, you will need large diameter pipe to make the diffuser deep enough. Quazi-random surfaces tend to diffuse well if they are large. But a 2 foot wide optimized diffuser will generally perform much better than a 2 foot wide random surface. You could of course add semi-cylinders to the top of a stepped diffuser, in the same way that the Leanfractal is made my mounting fractal cells to each step of the Leanfuser.
Fantastic stuff! Not sure I have my head around all this at the moment but you very eloquently explained everything. Your diffuser designs look brilliant.
I have a room I wanted to treat. My question is, in a 8ft by 11ft room, would any of these diffusers make significant difference to the energy of sound in the room? Glad you like the designs. But it depends on many factors. It depends on what the room is used for, what is currently on the walls and what problems are being faced.
If diffusers are used at all in a small room, they should be the final element of room treatment. Great reply. Small room with no absorption here. Put up acoustic sound panels at each reflection point to control the sound. So now it sounds like once I have that perfected, I think try to liven up the room with Diffusion strategically placed. Thanks so much for this knowledge, Ive just signed up and am going to build some diffusors this weekend. A question about my room though, its a large 23 feet x 14 feet room.
What is the room used for? The fourth page has acoustic treatment setup advice for this type of room. There are many factors that determine how you should treat a room, and size is just one of them.
Changing the proportions alters the fundamental geometry, so I can only give an educated guess without seeing test results.
Intuitively I would think the extra depth will help diffusion performance i. This affects the stereophonic illusion very badly. Distance from ears to wall is about a foot 30cm or so , and can possibly be pushed to 40cm.
Is it at all possible to do this using a diffuser, and what version would be the minimum-complexity choice with some chance of providing a positive change?? But, these would be put to better use elsewhere like ceiling or sidewall reflection points , giving the scattered sound more space to disperse before it reaches your ears. Maybe using a slitted design with long internal paths. In practical application many people use them closer without issues, but the closer you are, the greater the risk of audible artifacts.
Sound travels about 17 feet in 15 ms, so to meet this goal you need first reflections to travel at least 17 feet further than the direct sound. Otherwise, they should be treated to be at least 10 dB below the direct sound. Otherwise you need to get creative with reflection control. Possible candidates are the rear ceiling, rear sidewall and the left and right portions of your rear wall.
I hope this helps. Is there a problem, or has something prevented the emails getting to me?? There should have been a conformation email sent to you, with a link that leads to the download vault. It says it worked yesterday with a new email address you tried.
Did you get a followup email? I always had the idea that should be absorbed in that area in order to get just clean sound from the speakers and noting else. In many cases the front wall does not need to be absorptive as most speakers are directional at higher frequencies. Diffusers on the front wall are not essential — but they make the room sound more spacious and enveloping, making it an inviting space for spontaneous musical activities like practicing or recording.
Yes, and in a surround setup front wall diffusion diffusion may also be useful to diffuse first reflections from the rear surround speakers. Another benefit of diffusion is it tends to help even out the frequency response and decay times in the room. Hey Tim, I saw your answer to someone else that had a small room.
Hoping you could clarify it a but more. Do you think a 10x9x11 room would need diffusers? I am already getting 6 large bass traps and 2 large acoustic panels. Also a stupid question.. I want to add a couch for friends. Will that have a negative effect on the sound? Hi David, sorry I missed this message earlier. Whether or not you need diffusers depends on your goals for the room, and how much space you have behind you to create a delayed, diffuse energy return. Your couch will add a bit of absorption to the room, but I doubt it will have a negative impact on your sound.
Pl advice whether to go for diff users or absorbers. Hi Krishna, sorry I missed this message earlier. Pingback: Room Acoustics and Materials de notre son. Your information was a helpful introduction as I was getting started with acoustics. I have a new 12x15x8 ft control room. I was considering putting Schroeder 1-D diffusors on my left and rear walls.
I want to be able to record in the room with mic at 3 ft off the walls so I was arbitrarily limiting the design depth to put the design frequency at around KHz.
Some where you say the LF design point is about Hz. I was thinking cutting the heights on the 7 steps 0,40,70,60,80,50,10 of the module by about a factor of 2.
To get to about inches, I think I might want 6 of your modules? Do you have a recommended modulation in this case?
If I mount the modules at different depths, does this affect the lower frequency design point? Is there a way I could predict the performance of this design? In your thesis you show an Shroeder inverse panel as a degree rotate of the normal panel. A proper inverse has the depths of the normal panel subtracted from the prime used to design it and is different than a rotated panel. Would something like this actually improve your design? For instance, the normal module has heights of 0 40 70 60 80 50 10 and the inverse might have 60 30 40 20 50 90?
I understand that this would require two panel designs and might have other visual implications. Hi Rick, mm is simply a maximum depth I set to constrain the optimization and only optimize shallow diffusers. If I wanted to include possible designs up to 20 cm deep I would have instead chosen mm.
The initial design frequency of Hz comes from equation 6. The LF limits and all initial conditions in my paper are not predictions, they are simply constraints I used to set up the optimization problem.
All the best with your build. Hi Tim, Thanks for your info. Your thesis inspired me to do some more digging. My goals is to try to:. The cuttoff in my case is to give a 1 m safe distance. Optimize from K Hz on my iK 3. I was thinking to do this by looking at the Fourier transforms of a repeated surface profile.
Sounds like a very cool project! Thanks for pointing me to that paper. Finding the true inverse sounds simple in theory, but inverting often turns out to be an intensive problem.
Let me know how your project goes. Diffuser optimization is an esoteric interest shared by few, but a fascinating one! Green Fiber is ground cellulose mostly newspaper — so an open pore fibre matrix. It behaves almost identically to rockwool relative to sound transmission when used in walls.
Some folks on GearSluts have reported using it for base traps with good results — though nothing quantitative. I found one paper by someone academic that tested ground up cellulose not exactly like green fiber, but… and said it had very good absorption characteristics comparable to rock wool and provided coefficients for an acoustic impedance empirical prediction model ala Mechel and Grundmann, I think.
I was going to try just putting a stack of bales in each corner without unpacking it so I can return it if need be and do some REW measurements to see what it does do my waterfall response. Thanks for the idea of doing the optimization of the 5 panels with 4 fixed.
Chandler-Wilde Ivan G. Graham Stephen Langdon Euan A. Spence Also helpful background paper from same folks this was best reference for bootstrapping on BEM stuff that I found — might be helpful for other folks like me groping around to figure this stuff out : Boundary element methods for acoustics Simon Chandler-Wilde and Steve Langdon Hi Rick, Thanks for the information on Green Fiber. My intuitive concern is the gass flow resistivity of a blown product like that when compared to loose fill fiber and batt insulation like Rockwool.
Testing is of course the best way to know. I do have Boundary Element Methods for acoustics but decided to work in the time domain instead. I went a bit into finite element methods FEM while doing physical modelling and sound synthesis research e. Ask us for a free acoustic analysis so we can identify your key issues and help you enjoy clean, clear sound wherever you need it. What Is Sound Diffusion? Share This Post. In the Media Our Guarantee. How Can We Help?
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