Okay guys, strange issue here, or I just might be stupid. After hearing the Marshall Studio Vintage head in Youtube vids I fell in love with it, basically because I love the old Super Lead sounds. I first tried it at a Music Store, but it had this really dirty fizz in the highs when I played with harder pick attack. Back at home I checked some of those video's again and didn't hear anything fizzy. I figured I just order one and try it with my own gear. I could send it back after all. Now, I have two almost identical cabs: a Palmer 2x12" 50 watt with two Greenbacks and the 1x12" 25 watt version of the same amp. I tried the latter first and none of that fizz, it sounds awesome and exactly how I wanted with this cab. But when I use the 2x12" I get that damn fizz again. And only with that head, no fizz with my other Marshall head. Does anyone have an idea what this could be? It's really annoying and I want to figure out what causes this.