Compact spherical loudspeaker arrays exhibit controllable directivity, and electroacoustic music recently became interested in using their beamforming capacities to compose spatial music. In particular, directivities of 3rd-order or higher turned out to o?er a suÿciently precise horizontal control. Our engineering brief proposes the 170 compact spherical loudspeaker design that is DIY-3D-printable and only uses 8 audio channels. The 170 array houses seven 2.5” broadband transducers that allow third-order horizontal beamforming and a 6” subwoofer. We make the CAD model, electroacoustic measurements, and control filters openly accessible and show it’s beampatterns for verification, based on those measurements.

Authors: Drack, Valerian; Zotter, Franz; Barrett, Natasha
Affiliations: University of Technology, Graz; Institute of Electronic Music and Acoustics, University of Music and Performing Arts, Graz, Austria; Norwegian Academy for Music(See document for exact affiliation information.)
AES Convention: 148 (May 2020) eBrief:607
Publication Date: May 28, 2020
Subject: Loudspeakers & Microphones

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