Hey, first post... ok right now I'm playing an ampeg v-b6 (weird old solid state head... don't see em much) with a sunn graphic eq through an ampeg 8x10. Always been fairly satisfied with it. I recently had the opportunity to play a friends gk rb400. The tone was just infinitely more what I wanted than the ampeg was giving me. Way more growl to it, much more defined. Plus they're very much in my price range (200-250 used). So I think I'm gonna unload the ampeg/sunn contraption and find a rb400... ok enough rambling, get to the actual question... Has anyone played both the 400 and the 400-III? Are there any noticeable differences in sound? Or is it purely a wattage thing? I would imagine they'd sound pretty similar, but I just wanted to make sure I wouldn't get any surprises if I got a III. Thanks.