Point Source Loudspeaker Design: Advances on the Inverse Horn Approach

Ortiz S, Kolbrek B, Cobo P, González LM, Colina CDL. Point Source Loudspeaker Design: Advances on the Inverse Horn Approach. J Audio Eng Soc. 2014;62(5):345-354. doi:10.17743/jaes.2014.0018

@article{Ortiz2014_17245,
  author = {Ortiz, Santiago and Kolbrek, Bjørn and Cobo, Pedro and González, Leo M. and Colina, Carlos de la},
  title = {{Point Source Loudspeaker Design: Advances on the Inverse Horn Approach}},
  journal = {Journal of the Audio Engineering Society},
  volume = {62},
  number = {5},
  pages = {345--354},
  year = {2014},
  month = may,
  publisher = {Audio Engineering Society},
  doi = {10.17743/jaes.2014.0018},
  url = {https://doi.org/10.17743/jaes.2014.0018}
}

TY  - JOUR
TI  - Point Source Loudspeaker Design: Advances on the Inverse Horn Approach
AU  - Ortiz, Santiago
AU  - Kolbrek, Bjørn
AU  - Cobo, Pedro
AU  - González, Leo M.
AU  - Colina, Carlos de la
T2  - Journal of the Audio Engineering Society
J2  - J. Audio Eng. Soc.
VL  - 62
IS  - 5
SP  - 345
EP  - 354
PY  - 2014
DA  - 2014/05/06
DO  - 10.17743/jaes.2014.0018
UR  - https://doi.org/10.17743/jaes.2014.0018
PB  - Audio Engineering Society
LA  - en
AB  - The conventional design of an omnidirectional source uses a polyhedral speaker to emulate a spherical radiating sound wave. But this approach does not work at short distances and at higher frequencies. The inverse horn design proposed by Polack, a conventional loudspeaker matched to a small aperture through a reverse horn, provides a good approximation to an omnidirectional point source. But this solution has a rather irregular frequency response that arises from the acoustic resonances of the air inside the horn cavity. This research described two implementations of an equalized reverse horn source that have the desired directional characteristics of a point source with a flat frequency response of +/-3 dB from 100 Hz to 8 kHz. There are various trade-offs in selecting the sizes.
ER  -