In general, the rougher the surface, the more absorptive, so fractal diffusers tend to be more absorptive than their non-fractal siblings. In addition to diffusion, all diffusers will exhibit a small amount of absorption (measured using the sound absorption coefficient). The resulting diffuser would have an operational depth of 40 cm, which is a much deeper design than the one we started with!īoundary element model (BEM) simulation for fractal diffuser B2-Frac (array of 5 modules).ĭiffusers with High Sound Absorption Coefficients ( Diffsorbers) This would give you a profiled modulation of 7x. Since the deepest step of this stepped diffuser is 5 cm, you would scale all the depths by 35 cm / 5 cm = 7. Considering an array of 7 acoustic diffuser panels (294 cm wide), the deepest step of the profiled modulation would be 294 cm / 8.4 = 35 cm. For example, you could create a low frequency fractal stage with the proportions equal to the stepped diffuser proportions (I.e., keeping the width:depth ratio consistent).įor the Leanfuser™, the width:depth ratio = 42 cm / 5 cm = 8.4. If you wanted to build a deeper diffuser, you could take the fractal self-symmetry concept even further. Sound diffusion coefficient data obtained from a boundary element model (BEM) simulation. Stepped diffuser A1-LF (Leanfuser) with a profiled modulation based on fractal self-symmetry (array of 7 panels mounted at specific heights). This diffuser offers the low profile, modular benefits of its little brother, with an extended diffusion bandwidth for better high frequency performance. The Leanfractal™ (called A1-Frac in the thesis), a fractal version of the Leanfuser™.Fractals are an elegant way to extend the bandwidth of the diffuser, improving its ability to scatter sound at higher frequencies. Next, the optimized module’s shape was used to generate fractal geometries. This was designed by optimizing diffuser modules in an aperiodic array (explained in Chapter 7 of the thesis). The Stepfractal™ (called B2-Frac in the thesis), which offers better high frequency diffusion but is less DIY friendly.Many people have been surprised at how quick these are to build, and how well they perform! (See the thesis for an extended design called A1-Frac, or the Leanfractal™)
This is the easiest sound diffuser panel to make (way easier than building a DIY QRD diffuser or DIY Skyline ® diffuser). The Leanfuser™ (called A1-LF in the thesis) - a ridiculously simple, low profile, modular stepped diffuser.The thesis gave birth to many possibilities for modular sound diffusers (large diffusers, assembled using small diffuser panels called modules). If you’re interested in the nerdy details, check out Chapters 6-7 of the diffuser design thesis. To design these diffusers, I used a system that combines evolutionary optimization (simulated natural selection) with physical modeling. Optimized Stepped Diffusers and Fractal Diffusers Instead, they disperse it, spreading the energy around the room.Īn ideal acoustic diffuser is a surface that causes an incident sound wave from any direction to be evenly scattered in all directions. Unlike absorption, diffusers preserve the liveliness of your room because they don’t absorb much sound energy. Scattering simulations (right).Ī sound diffuser is an acoustic panel used to treat echoes and reflections. Modular, optimized stepped diffuser (top). FAQ: Frequently Asked Questions about these DIY Sound DiffusersĪcoustic diffuser designs.Gallery: Photos of Sound Diffuser Builds.Free Report on Recording Studio Acoustics (Including Diffuser Applications).Free Report on Eco-Friendly Acoustic Materials.Learn About the Various Types of Sound Diffusers (Chapter 2 of the Thesis).Free Design Report: How Optimization is Used to Design Acoustic Diffusers.Diffuser Performance: Sound Diffusion Coefficient Graphs.I’ll be updating this page periodically, so check back often! Here’s everything you need to start building diffusers. Background research draws from the works of Trevor Cox, University of Salford Peter D’Antonio, RPG Diffusor Systems Inc. for additional restrictions on fractal diffusers. Stepped Diffuser Designs in Chapters 7.3 and 8 of “The Lean Optimization of Acoustic Diffusers” by Tim Perry are licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
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