A Study of Low-Frequency Near- and Far-Field Loudspeaker Behavior

Vanderkooy J, Rousseau M. A Study of Low-Frequency Near- and Far-Field Loudspeaker Behavior. In: AES Convention 126. Audio Engineering Society; 2009. Paper 7747. Available from: https://aes.org/publications/elibrary-page/?id=14943

@inproceedings{Vanderkooy2009_14943,
  author = {Vanderkooy, John and Rousseau, Martial},
  title = {{A Study of Low-Frequency Near- and Far-Field Loudspeaker Behavior}},
  booktitle = {AES Convention 126},
  note = {Paper 7747},
  year = {2009},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=14943}
}

TY  - CPAPER
TI  - A Study of Low-Frequency Near- and Far-Field Loudspeaker Behavior
AU  - Vanderkooy, John
AU  - Rousseau, Martial
T2  - AES Convention 126
M1  - Paper 7747
PY  - 2009
DA  - 2009/05/06
UR  - https://aes.org/publications/elibrary-page/?id=14943
PB  - Audio Engineering Society
LA  - en
AB  - Low-frequency loudspeaker measurements are difficult. Room reflections, mediocre anechoic chambers, and random noise play havoc with the quest. Diffraction is different in nearfield and farfield. This paper covers a range of topics that bear on these problems, such as boundary element diffraction simulations, an approximate theory for low frequencies, methods to shorten the impulse response, and nearfield characteristics. A few points are illustrated with measurements. An earlier simplified diffraction theory of Kessel is checked for axisymmetric cylindrical and rectangular boxes by boundary-element simulations, in an attempt to pin down the diffractive 4pi>2pi transition. It turns out to have a strong connection to the acoustic centre of a loudspeaker. Some measurements are made under various conditions. Shortening methods are used to minimize the deleterious effect of truncating room reflections from the impulse response.
ER  -