Strategies for Obtaining True Quasi-Anechoic Loudspeaker Response Measurements

Vanderkooy J. Strategies for Obtaining True Quasi-Anechoic Loudspeaker Response Measurements. In: Express Paper. Audio Engineering Society; 2025. Paper 310. Available from: https://aes.org/publications/elibrary-page/?id=22861

@inproceedings{Vanderkooy2025_22861,
  author = {Vanderkooy, John},
  title = {{Strategies for Obtaining True Quasi-Anechoic Loudspeaker Response Measurements}},
  note = {Paper 310},
  year = {2025},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=22861}
}

TY  - CPAPER
TI  - Strategies for Obtaining True Quasi-Anechoic Loudspeaker Response Measurements
AU  - Vanderkooy, John
M1  - Paper 310
PY  - 2025
DA  - 2025/05/12
UR  - https://aes.org/publications/elibrary-page/?id=22861
PB  - Audio Engineering Society
LA  - en
AB  - Simple truncation of the reflections in the impulse response of loudspeakers measured in normal rooms will increasingly falsify the response below about 500 Hz for typical situations. Well-known experience and guidance from loudspeaker models allow the determination of the lowest frequency for which truncation suffices. This paper proposes two additional strategies for achieving much improved low-frequency responses that are complementary to the easily-obtained high-frequency response: (a) a previously published nearfield measurement which can be diffractively transformed to a farfield response with appropriate calculations, here presented with greatly simplified computations, and (b) a measurement setup that admits only a single floor reflection which can be iteratively corrected at low frequencies. Theory and examples of each method are presented.
ER  -