@conference{oyaba1985development, title = {Development of a New Loudspeaker System Having Extended Frequency Range and Low Distortion Particularly at Low Frequencies and High Power Levels}, author = {Oyaba, Takashi and Takahashi, Shunichi}, booktitle = {Audio Engineering Society Convention 79}, month = {Oct}, year = {1985}, url = {https://www.aes.org/e-lib/browse.cfm?elib=11475} }