When I connect my E520 which has Integrated Audio(313-2758) to my NAD Home\nreceiver I get a hum... I first used a Y adapter for the Dell Sound Bar and\nhome receiver, the home receiver hummed but the sound bar did not, then\ndisconnected the Y and directly connected the PC to the receiver and still\nit hummed. THEN unplugged it from the PC and plugged into my iPod and no\nhum, perfectly clear.. I'm stumped here, can't be a power issue since I'm\nsure the E520 has more juice then the iPod, any ideas???