From Mike SynMike Sent Mon, Jun 11th 2018, 13:38
A ground loop buzz is most often this is solved by plugging all devices = (including the computer) into one power source. If that doesn't work, a = Direct Box can often fix it. But given that your buzz stays on a specific input channel even when you = swap the instruments around, I=E2=80=99m guessing it is a cable problem. = Try a different audio cable on input 3. Are you sure you are using the = same power cables as before the move? I once found that I had a power = cable that was wired wrong from the factory. Mike. > On Jun 11, 2018, at 6:13 AM, Sxnths <xxxxxx@xxxxx.xxx> wrote: >=20 > Hello, >=20 > I moved temporarily my studio to my gf apartment and I can't tell if = she worked some black magic or I am being stupid.. I am faced with a = rather simple ground loop issue that I can't solve. It seems to be = between a Macbeth M5 and an Andromeda A6. They both go into a RME = Babyface. I see the hum showing up on the input(s) mixer (even when the = speakers are off or unplugged). >=20 > One configuration causing the buzz is having the macbeth on input 3 = (simple 1/4") and the Andromeda on inputs 1/2 in stereo (those are = balanced XLR inputs but I believe the Andromeda main outputs are = unbalanced ... not sure if I do something wrong here already). The buzz = occurs as soon as the andromeda is plugged in and the power cable = connected (it doesn't have to be on). The buzz is coming on the input 3 = (the macbeth).=20 >=20 > I tried to switched and have the macbeth on the balanced inputs and = sure enough ... buzz occurring on input 3 again (the andromeda's input = this time).=20 >=20 > I tried moving plugs around, connecting to other outlets, close by, = far, etc etc. With no luck. >=20 > I guess I have multiple questions at this point:=20 > - am I doing something wrong with the balanced cable? Does it needs to = have a special wiring to go from balanced to unbalanced?=20 > - can there be some missing isolation or connection inside the = synthesizers causing the buzz? Any way to test for that?=20 > - is there any device that can help with this? Can the power strips be = a culprit?=20 >=20 > Thank you in advance for the help >=20 >=20