I think they mean to get the amp off the ground by a few feet, not an inch.. I doubt an inch is gonna make any noticeable difference. I think getting it higher may help get away from floor reflections or something. I'd put a 2x12 combo on a chair or table or something when I played em live, just so it wasn't pointed at my feet, I could hear it better. And I wouldn't have to stoop down to change settings. With a 4x12 slant cab, the top speakers are pointed up a little, and they're high enough anyway, and you can mic a top speaker, and you mic is way off the floor anyway.