Alright, i just got a pair of SONY MDR-7506 headphones - probably the first piece of truly good audio equipment i've ever bought. I hooked them up directly to my sound card - they sound great. Decided to also try hooking them up to my receiver. They sound far better, extremely noticable improvment. Only problem is that when they are hooked up through the receiver, i hear a low hum even when music isn't playing. What's causing this? My receiver? The cable that connects it to the PC? Receiver: Pioneer '98 model mid-quality Sound card: Creative Labs Audigy Cable: Cheapo $9.99 Radio Shack Style Thanks, hope someone out there knows how to get rid of it. It's not too noticable when music is playing but i'd rather not have it there.