Hi everybody, I'm new here and I know very very little about high end audio. I am a producer and I am looking to upgrade from my current headphones. As of right now I have a pair of Sony MDR-xb700's. I am looking to get something more serious maybe in the $500 dollar price range. I am looking for something that is closed back and either has very very good passive noise canceling or has active noise canceling. I don't like when my headphones leak whether it be letting sound...