@conference{keele2003comparison, title = {Comparison of Direct-Radiator Loudspeaker System Nominal Power Efficiency vs. True Efficiency with High-Bl Drivers}, author = {Keele, Jr., D. B. (Don)}, booktitle = {Audio Engineering Society Convention 115}, month = {Oct}, year = {2003}, url = {https://www.aes.org/e-lib/browse.cfm?elib=12453} }