Directivity Measurement of In-Wall Loudspeakers

In this article, the authors share their research on new requirements for the measurement of in-wall installation speakers. The directional characteristics are an especially important factor, because the direction in which a loudspeaker emits sound highly affects the interaction with the listening room and the listening experience. The authors' research addressed the requirement using holographic directivity to address the way the directional characteristics interact with the listening room. This article was originally published in audioXpress, December 2021.

This article illustrates how the latest Klippel Multi-Scanning Workbench solution allows measurements across several domains (acoustical, mechanical, electrical, and magnetic) while working from non-anechoic environments. The author uses a practical characterization of balanced mode radiator (BMR) loudspeakers, which require a more complex approach when compared to conventional cone-based woofers or dome-tweeters. This article was originally published in Voice Coil, May 2021.

Announced earlier in 2020, Klippel now confirmed availability of its new SCN Near-Field Add On (SCN-NF), a new solution that accurately enables all the most relevant transducer measurements using a single hardware setup in a non-anechoic room. This new powerful addition to the Klippel Scanning Vibrometer is a smart alternative to using an anechoic chamber, and the fastest way to get full directivity holographic measurements, extrapolate SPL to any point in 3D half-space and obtain balloon, contour, polar and sound power plots.