Thought I’d give the 55hz greenback a try in the new cabinet I am building for the origin 5. Will let you know what it’s like, I went for the 55hz as I liked the description of its sound in one of the vintage celestion information websites. I think most go for the 75hz is that right? They were all quite a bit more than what I paid for the 55hz though. Covering it with that ying/yang type patterned tolex that I think bogner use. Going to be one sexy looking combo. Lol. Leather dog bone strap. 22mm solid pine and Baltic ply for the front baffle. Using same grill cloth pattern as original combo.