I've tried everything I know. I have the amp sounding good at ear level in the room. When I put a SM-57 on it I always hear a fizzy phasey sounding mess that's hard to get rid off. what the crap am I doing wrong? Again it sounds good in the room/ear level (other than being loud). Mesa 2x12 cab - V30's SM-57 Cab is in decent room, pulled about 1ft out from wall. Any tips that don't involve burning the whole rig and starting over?!?!