Hey guys, I'm new here so apologies if I could have posted this in a better section Today I purchased some 2nd hand Rokit 6's. They sound amazing when hooked up to my Roland MC505 but when I add a 1/4 > 3.5mm adaptor so I can plug them into my PC...I get this nasty whistling noise when plugged in. It sounds like a slight breeze is going through the speakers. I can't hear the noise when music is playing from the PC. I tried turning off router and putting the Rokit's on their own power adapter/extension - no luck. The set up is as follows: 1/4 inch mono from each Rokit > 1/4 inch stereo jack male to twin mono 1/4 inch female adapter > 1/4 stereo to 3.5mm adaptor How can I eliminate this whistling noise? I should add it gets worse when increase the volume on the back of the Rokit. Thanks in advance.