Dynamical Measurement of the Effective Radiation Area SD

Klippel W, Schlechter J. Dynamical Measurement of the Effective Radiation Area SD. In: AES Convention 128. Audio Engineering Society; 2010. Paper 8075. Available from: https://aes.org/publications/elibrary-page/?id=15372

@inproceedings{Klippel2010_15372,
  author = {Klippel, Wolfgang and Schlechter, Joachim},
  title = {{Dynamical Measurement of the Effective Radiation Area SD}},
  booktitle = {AES Convention 128},
  note = {Paper 8075},
  year = {2010},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=15372}
}

TY  - CPAPER
TI  - Dynamical Measurement of the Effective Radiation Area SD
AU  - Klippel, Wolfgang
AU  - Schlechter, Joachim
T2  - AES Convention 128
M1  - Paper 8075
PY  - 2010
DA  - 2010/05/06
UR  - https://aes.org/publications/elibrary-page/?id=15372
PB  - Audio Engineering Society
LA  - en
AB  - The effective radiation area SD is one of the most important loudspeaker parameters because it determines the acoustical output (SPL, sound power) and efficiency of the transducer. This parameter is usually derived from the geometrical size of the radiator considering the diameter of half the surround area. This conventional technique fails for microspeakers and headphone transducers where the surround geometry is more complicated and the excursion does not vary linearly versus radius. The paper discusses new methods for measuring the SD more precisely. The first method uses a laser sensor and microphone to measure the voice coil displacement and the sound pressure generated by the transducer while mounted in a sealed enclosure. The second method uses only the mechanical vibration and geometry of the radiator measured by using a laser triangulation scanner. The paper checks the reliability and reproducibility of conventional and the new methods and discusses the propagation of the measurement error on the T/S parameters using test box perturbation technique and other derived parameters (sensitivity).
ER  -