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S. Degraeve, and J. Oclee-Brown, "The Watkins Woofer," J. Audio Eng. Soc., vol. 71, no. 1/2, pp. 45-52, (2023 January.). doi: https://doi.org/10.17743/jaes.2022.0045 S. Degraeve, and J. Oclee-Brown, "The Watkins Woofer," J. Audio Eng. Soc., vol. 71 Issue 1/2 pp. 45-52, (2023 January.). doi: https://doi.org/10.17743/jaes.2022.0045
Abstract: The Watkins Woofer is an arrangement, invented and patented by William (Bill) Watkins and subsequently used by Infinity, that uses a novel technique to increase the efficiency of an infinite baffle or closed box loudspeaker. Watkins himself described succinctly the principle of operation of his dual-coil woofer, but no rigorous analysis was published. Furthermore, the self- and mutual inductances were ignored, causing a dip in the impedance magnitude. Using the same approach as Thiele and Small, the Watkins woofer is - for the first time - fully analyzed to outline the volume, bandwidth, and sensitivity trade-offs.

@article{degraeve2023the,
author={degraeve, sébastien and oclee-brown, jack},
journal={journal of the audio engineering society},
title={the watkins woofer},
year={2023},
volume={71},
number={1/2},
pages={45-52},
doi={https://doi.org/10.17743/jaes.2022.0045},
month={january},} @article{degraeve2023the,
author={degraeve, sébastien and oclee-brown, jack},
journal={journal of the audio engineering society},
title={the watkins woofer},
year={2023},
volume={71},
number={1/2},
pages={45-52},
doi={https://doi.org/10.17743/jaes.2022.0045},
month={january},
abstract={the watkins woofer is an arrangement, invented and patented by william (bill) watkins and subsequently used by infinity, that uses a novel technique to increase the efficiency of an infinite baffle or closed box loudspeaker. watkins himself described succinctly the principle of operation of his dual-coil woofer, but no rigorous analysis was published. furthermore, the self- and mutual inductances were ignored, causing a dip in the impedance magnitude. using the same approach as thiele and small, the watkins woofer is - for the first time - fully analyzed to outline the volume, bandwidth, and sensitivity trade-offs.},}

TY - paper
TI - The Watkins Woofer
SP - 45 EP - 52
AU - Degraeve, Sébastien
AU - Oclee-Brown, Jack
PY - 2023
JO - Journal of the Audio Engineering Society
IS - 1/2
VO - 71
VL - 71
Y1 - January 2023 TY - paper
TI - The Watkins Woofer
SP - 45 EP - 52
AU - Degraeve, Sébastien
AU - Oclee-Brown, Jack
PY - 2023
JO - Journal of the Audio Engineering Society
IS - 1/2
VO - 71
VL - 71
Y1 - January 2023
AB - The Watkins Woofer is an arrangement, invented and patented by William (Bill) Watkins and subsequently used by Infinity, that uses a novel technique to increase the efficiency of an infinite baffle or closed box loudspeaker. Watkins himself described succinctly the principle of operation of his dual-coil woofer, but no rigorous analysis was published. Furthermore, the self- and mutual inductances were ignored, causing a dip in the impedance magnitude. Using the same approach as Thiele and Small, the Watkins woofer is - for the first time - fully analyzed to outline the volume, bandwidth, and sensitivity trade-offs.