Porous absorbers are a treatment for acoustic problems, as well as to reduce noise and resonance. To understand how they work, we must first look into the physics of it all. The Physics of Porosity Due to viscous boundary layer effects, when a sound spreads in a small space, it loses energy. It can lose…
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Membrane absorbers, also known as panel and diaphragmatic absorbers, use the resonant qualities of a membrane to take in sound over a narrow frequency range. Their composition is of pressed wood fibers and soft panels, as well as rigid or semi-rigid materials like plastic. When mounted on a solid wall and separated by a narrow…
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Resonance absorbers, also known as tuned traps, pressure absorbers, or narrowband absorbers, are devices that are frequency-dependent. This is because of the desired resonance of a particular material at a specific wavelength. There are several types of resonance absorbers. Some examples are the Jaumann absorber, the Salsbury screen, and the Dallenbach layer. In addition, there…
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Monitor isolation pads are pads that decouple the monitor from the surface. These devices are made of dense acoustic foam and metal spikes on which the speakers rest. The pads isolate the monitor from the stand making sure that the speaker operates in an independent way with no additional vibration. In addition, they also prevent…
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Rotary woofers are a type of loudspeaker that uses the coil’s movement to modify the pitch of a set of fan blades. They create sounds below the normal level of human hearing, which is 20Hz. By compressing the air in a closed room, these woofers produce frequencies below 0Hz. The rotary woofer displaces air by…
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Digital speakers, also known as Digital Sound Reconstruction systems, involve loudspeaker technology. These types of speakers are different from modern digital formats and processing because engineers have not yet developed them as a mature technology. How Digital Speakers Work This kind of speakers bring the digital signal closer to the transduction process and are capable…
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Electromagnetic speakers are the grandparents of electrodynamic ones. The former emerged around 1860. However, it took over 40 years to develop the knowledge of acoustics, materials, math, and frequencies that gave birth to the kind of electrodynamic speakers that we know today. The then recent developments in vacuum tubes were extremely helpful for control of…
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