Never played the 1x12 since it's pretty new, so not sure on differences, but I think it's pretty much the same as the 2x12 just smaller. But the 6505 combo isn't going to quite nail the hatebreeder sound. It's a really heavy amp, so it's great for metal, but not quite the hatebreeder sound, and I think alexi used it for something wild (actually a 5150, but it's the exact same amp). Not sure what else could really nail hatebreeder tone besides the GP1000. I recommend that you go out to a local music store and try out a bunch of amps if you can.