As Mr. Widget replied that is the filter used in the BX-63 and that can easily be duplicated using DSP. I have a crown amp for my HT subs and use the...
Virtually all true subwoofers as opposed to woofers require some form of frequency optimization. This can be via an active or passive analog network...
Pretty clear from the pattern pressed by the metal grill in to the gasket that this driver was in a PA box and likely lived a hard life. Covering the...