If you must use RCA interconnects, select ones with the lowest shield impedance you can get, additionally you might try reduce balancing currents of class-I devices by bonding all the metal chassis' together tightly with extra wires, close to the cable breakouts. Use long USB cable and clamp lots of ferrites on it. Galvanic isolation by way of converting your signal to TOSLINK will get rid of a lot of the noise generated by a graphics card. So what do you do if you can’t eliminate the conditions for ground loops You can use a signal isolator, as shown in Fig. Balancing current still flows but has way less impact on the transmitted signal because the shield is not part of the "signal path" anymore. High powered graphics cards are a pretty big problem in USB audio, especially if you are running more sensitive equipment like a tube headphone amplifier. In addition to ground loop hums, unfortunately, there’s plenty of other equipment that can also create unwanted. Deal with the symptoms : use balanced cabling if possible. PYLE-PRO Compact Mini Hum Eliminator Box - 2 Channel Passive Ground Loop Isolator, Noise Filter,AC Buzz Destroyer,Hum Killer w/ 1/4' TRS Phone,XLR Input/Output,Uses 1:1 Isolation Transformer - PHE400. insert an USB isolator (I'm using the device made by Intona, works flawlessly) or use TOSLINK. Toyota toyotatacoma caraudioDo RCA Ground Loop Isolators WorkHey guys in this video I am trying to fix a buzzing noise that I got from the audio upgrade. ![]() Fix the cause: Break the loop, preferably on the digital side, eg. The voltage difference on the PE points forces a so-called balancing current on the cable shield which in turn produces a voltage drop (because its resistance/impedance is not zero) and this appears as a noise signal on the amp input. Both ends of the RCA cable shields are connected to different and dirty Earth Grounds (PE).
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