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S. Ortiz, B. Kolbrek, P. Cobo, LE. M.. González, and CA. LA. Colina, "Point Source Loudspeaker Design: Advances on the Inverse Horn Approach," J. Audio Eng. Soc., vol. 62, no. 5, pp. 345-354, (2014 May.). doi: https://doi.org/10.17743/jaes.2014.0018 S. Ortiz, B. Kolbrek, P. Cobo, LE. M.. González, and CA. LA. Colina, "Point Source Loudspeaker Design: Advances on the Inverse Horn Approach," J. Audio Eng. Soc., vol. 62 Issue 5 pp. 345-354, (2014 May.). doi: https://doi.org/10.17743/jaes.2014.0018
Abstract: 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.

@article{ortiz2014point,
author={ortiz, santiago and kolbrek, bjørn and cobo, pedro and gonzález, leo m. and colina, carlos de la},
journal={journal of the audio engineering society},
title={point source loudspeaker design: advances on the inverse horn approach},
year={2014},
volume={62},
number={5},
pages={345-354},
doi={https://doi.org/10.17743/jaes.2014.0018},
month={may},} @article{ortiz2014point,
author={ortiz, santiago and kolbrek, bjørn and cobo, pedro and gonzález, leo m. and colina, carlos de la},
journal={journal of the audio engineering society},
title={point source loudspeaker design: advances on the inverse horn approach},
year={2014},
volume={62},
number={5},
pages={345-354},
doi={https://doi.org/10.17743/jaes.2014.0018},
month={may},
abstract={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.},}

TY - report
TI - Point Source Loudspeaker Design: Advances on the Inverse Horn Approach
SP - 345 EP - 354
AU - Ortiz, Santiago
AU - Kolbrek, Bjørn
AU - Cobo, Pedro
AU - González, Leo M.
AU - Colina, Carlos de la
PY - 2014
JO - Journal of the Audio Engineering Society
IS - 5
VO - 62
VL - 62
Y1 - May 2014 TY - report
TI - Point Source Loudspeaker Design: Advances on the Inverse Horn Approach
SP - 345 EP - 354
AU - Ortiz, Santiago
AU - Kolbrek, Bjørn
AU - Cobo, Pedro
AU - González, Leo M.
AU - Colina, Carlos de la
PY - 2014
JO - Journal of the Audio Engineering Society
IS - 5
VO - 62
VL - 62
Y1 - May 2014
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.