@conference{dobrucki1999symmetrical, title = {Symmetrical Loudspeaker Band-Pass Systems of Eighth Order with Active Filter}, author = {Dobrucki, Andrzej and Matusiak, Grzegorz}, booktitle = {Audio Engineering Society Convention 107}, month = {Sep}, year = {1999}, url = {https://www.aes.org/e-lib/browse.cfm?elib=8168} }