Hey, so ever since I got my Sennheiser 280s and my Korg PMs I've noticed a high pitched noise whenever audio is transmitted to the speakers or headphones. I'm fairly certain this has to do with my wiring, but could it be my soundcard or something with my drivers? I don't have the issue when I'm listening to music off iTunes, YouTube, or on my phone, so it definitely isn't the equipment. And no, it's not tinnitus .