Hey everyone, could use some advice on how to deal with what I think is a ground loop hum pretty audible through my speakers--annoyingly audible at low listening levels.\n\nEquipment:\nMarantz SR7011 receiver\nAragon 4044 mkii amp\nWillsenton R800i 845\nOppo UDP203 blue ray player\nRoku HD one\nLG TV\nTekton DIs\nLa Scala AL5s\n\nWhen I was running the Marantz with the Aragon (pre-out for the R\/L speakers) and the DIs, I didn't have a very audible hum (it was there, just very slight and not distracting from the listening position). But I have been starting to upgrade my system and bought the La Scalas and most recently the Willsenton.\n\nI first got the LA Scalas and when I used them with the Aragon amp, no problem. When I got the Willsenton I replaced the Aragin with it. Initially I'm not sure I heard a hum (I think I only the Oppo connected). But since I hooked up the Willsenton to the pre-out of the Marantz, I get the hum.\n\nThe hum sounds like a 60Hz ground loop hum. It does not increase in volume if I adjust the volume on the amp nor the receiver. I've tried various power plug positions and made sure they're all on the same circuit. The hum mostly goes away (but not completely) without the Marantz plugged in. But I can plug in the Marantz to the Willsenton with the DIs and the hum is much less audible (maybe the efficiency of the La Scalas is amplifying the hum?).\n\nI was thinking of buying a couple of the following items to remove the hum. Not sure if that is the best idea, any advice?\nJensen Transformers CI-1RR Audio Hum\/Noise\/Buzz Eliminator\/ Ground Isolator \n\nNot sure what I can do, nothing seems to work.