@article{klipsch1970modulation, title = {Modulation Distortion in Loudspeakers: Part 2}, author = {Klipsch, Paul W.}, journal = {J. Audio Eng. Soc}, volume = {18}, number = {1}, pages = {29--33}, year = {1970}, url = {https://www.aes.org/e-lib/browse.cfm?elib=1529} }