I recently had the same issue. The problem was reported in in this post Prime 2 headphone issues The headphone outputs are grossly overdriven and it did at first cause me to question if my headphones were blown but is okay on other equipment. The headphone output seems to distort when you turn up the bass control centrally either when you are previewing a track or bringing in the bass in the mix. This is a definite problem and I’m going to contact my sales support as my warranty expires in a couple of months.