ISEAT 2026
KLIPPEL is heading to ISEAT 2026 in Shenzhen, China
From September 12–13, 2026, the 11th International Symposium on Electroacoustic Technologies (ISEAT) will bring together renowned experts, industry leaders, and senior engineers from around the world to discuss the latest developments in electroacoustic technologies and applications. Together with our Chinese distributor Klippel Technologies, our engineer Christian Bellmann will attend the event to connect with industry professionals and present KLIPPEL’s latest measurement and testing solutions for electroacoustic systems.
Christian Bellmann will also present the paper “Acoustic Center Localization for Holographic Directivity Measurements of Loudspeakers”, co-authored with Prof. Wolfgang Klippel and Yuyang Liu.
In addition, visitors will have the opportunity to join a special ISEAT Master Class on “Vibration and Radiation of Loudspeakers”, taking place over two days:
- September 12, 2026 – 3 hours
- September 13, 2026 – 3 hours
Further information will be shared soon.
GENERAL INFORMATION ABOUT ISEAT 2026
- Date: September 12-13, 2026
- Location: Shenzhen, China
Discover further information and the program on the official ISEAT website!
EXPERIENCE OUR PAPER AT ISEAT 2026
Acoustic Center Localization for Holographic Directivity Measurements of Loudspeakers
by Christian Bellmann, Wolfgang Klippel, Yuyang Liu
Abstract: Holographic methods enable high-resolution loudspeaker directivity measurements with accurate low-frequency behavior and reliable high-frequency phase information, while requiring fewer measurement points than traditional turntable-based measurements. In spherical wave expansion, the sound field is represented by spherical harmonics and Hankel functions around a chosen expansion point. Although small mismatches of the acoustic center are automatically compensated, larger deviations increase the required expansion order and thus measurement effort. This work presents and evaluates methods for acoustic center localization to achieve more compact representations and reduced measurement time. Two classes of approaches are considered: delay-based methods, which estimate the acoustic center from sound propagation delays, and wave expansion-based methods, which optimize the expansion point based on properties of the spherical harmonic coefficients. The methods are evaluated using both simulated data and measurements of real loudspeakers. Results demonstrate frequency-dependent trade-offs between accuracy, speed, and robustness, and provide practical guidelines for selecting suitable localization strategies.
