The cabinet that began the extended low end revolution, the GENZ-BENZ ENCLOSURES GB 410T-XB 500-WATT 8-OHM 4 X 10". Jeff Genzler took bass to a deeper level leaving other companies scrambling to catch up. This is in used but roadready condition with a gnarl in the rat fur on top but hey, it's where you set the amp so only you will know. One speaker replaced with an Eminence Delta 10-A due to finger punch. You can have the repaired original as well. Price is $240 obo. Comes with a nylon dust cover.
Link for reference and specs- https://www.metrosound.com/bass/bass-amplification/29-bass-cabinets/25669/p442-genz-benz-enclosures-gb-410t-xb-500-watt-8-ohm-4-x-10-bass-amplifier-extension