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| Surfaces in which certain frequencies bounce off easily |
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| Surfaces that absorb certain frequencies and “deaden” the sound. |
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| A mix of absorption and reflection. Essentially, diffusors are meant to “scatter” sound. Diffusers may be natural or man made. They may be random or they may follow a mathematical formula. |
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| Outwardly rounded. Many diffusers are some type of convex and rarely concave. |
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| Examples of natural diffusers |
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| petrified wood, tree bark, stone walls, exposed brick, broken brick |
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| Constructed diffusers usually follow the…. |
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| Primitive Root Sequence or the Quadratic Residue Formula. |
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| General term for a directional diffusers, usually called an RPG if it follows math. |
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| Reflection phase grating- minute parallel lines (usually hardwood/plastic filler) that is meant for directional diffusion |
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| Resembles a city skyline. These diffusers follow the QRD formula as well, but are designed to be a “3D” diffuser, providing omnidirectional scattering. |
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| Same concept as a regular skyline, but the inverse mold of a typical design |
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| These types of diffusers are sometime semi-resonators. They trap a certain bandwidth of frequency inside, and scatter higher frequency. |
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| Based on the room’s three main axes: length, width, and height Between these walls, standing waves (resonance) travel along each axial mode, creating a range of frequencies that are accentuated according to the layout of the room. This is why certain frequencies are heard better in certain parts of the room. |
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| A wave of sound that bounces between two or more surfaces emphasizing one frequency over others. The area between two parallel walls resonate at certain frequencies; a standing wave IS resonance created by two PARALLEL walls. |
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| First interference of the primary axial mode. It’s good to place an absorber in front of wall to avoid heavy reflection and phasing. |
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| Bass traps, Korner Killer (made by aurelex), Baffles, Banners, Clouds |
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| Made to generally take in excess bass in a room. They can’t be bandwidth oriented in design. THey can only be deep enough to accomodate low frequencies. |
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| Made by Aurelex. Specifically meant for installation in corners. May be installed vertically or horizontally. |
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| go-bos (go-betweens) and hanging |
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| Go-betweens. Mobile baffles, usually reflective/diffusive on one side, absorptive on the other. |
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| Baffles are meant to obstruct reflections between __________ walls |
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| kinds of hanging absorbers |
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| hanging baffles, hanging banners and Clouds |
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| Used to be called “Contra Carpet”. flat absorbers that hang parallel to the ceiling. Sometimes they are meant to resonate specific frequencies and may be partially |
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| rebuilding the wall or walls so that they are not parallel with one another. Usually said as “the wall is splayed x degrees”or “the wall is canted x degree”. 6 degrees usually the maximum, normally referenced from a window. |
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| 2 doors installed in series. This is the best method of maintaining the consistency of the wall (or double wall) without using a single, extremely heavy door. The inside of the sound lock should be heavily absorptive |
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| The frequencies that an object vibrates at. |
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