@article{long1969design, title = {Design Parameters of a Dual Woofer Loudspeaker System}, author = {Long, Edward M.}, journal = {J. Audio Eng. Soc}, volume = {17}, number = {5}, pages = {515--524}, year = {1969}, url = {https://www.aes.org/e-lib/browse.cfm?elib=1559} }