Russ I know what you mean about the Fender Bassman. Although I never owned one I played through one on a few occasions and that thing really purred. I can't remember seeing one with 4x10 though that would be perfect. I am very fond of multiple 10s for both guitar and bass. Was that just available with that 59 model or was it an option Fender always offer ? The Bassman I played through had 4x12 from memory and they were all slightly angled into center not on a flat board like most speaker boxes.