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    KRK Rokit 6 static/whistling

    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...