I bought a '77 SF Music Master Bass amp last year for apartment playing. It's been pretty great with the standard issues of a crispy high and and no low end. My tone knob helps with the crispy high end, but I've been thinking of doing the Hasserl mods to the volume and tone to open up the low end of the amp. I'm also thinking of replacing the speaker. Are there bass specific mods for the MMB? The Hasserl mods are primarily for guitar. As for the speaker, I'm thinking of the Eminence BassLite, but I could be swayed. Your suggestions (including to shut up and leave the damn thing alone) are greatly appreciated.