They should all be the same unless you have manually altered them (the convenience of the SETUP preset, since most of the time we want to have the same EQ curve applied to all of the presets). As for the lack of difference between bypass and the other preset, you'll only hear a difference when the sub is getting a fair bit of information - and to hear the most difference, you'll probably need to have done a manual EQ in order to get the maximum benefit from the SMS-1.