Materials have been used to control waves propagation ever since, and optics is a prime example. In Loudspeaker Systems applications, there have also been approaches in the attempt of controlling waves by acoustic lenses. Metamaterials are artificial structures, typically periodic, composed of small mela-atoms that, in the bulk, behave like continuous material with unconventional effective properties without the constraints normally imposed by nature. This talk offers the opportunity to share what can be done with acoustic metamaterials in audio industry, especially in Loudspeaker Systems Design. The presentation brings back some approaches from the past that can be revisited using today's technologies. Moreover, this talk shows some of the already developed technologies that employ these extremely innovative materials.
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