I cannot hear noises when the system is idle. But I am not sure it (ground loop) does not hurt sound quality when the music is playing. As an example, I couldn't hear any hum, buzz, or noises before I put a Shunyata PLC for the digital and preamp gears. But the Shunyata PLC does improve sound quality, IMO. So this is not an academic question. Rather, it is more like trial and error.
This is why I want to solicit opinions from others who have experiences in this area.
The Jensen paper may be technically correct. But it may not describe all real life scenarios. Take Figure 1 in that paper as an example. It tried to explain the hum voltage potential at the power amp and suggested that it would cause hum. This may well be correct. But both my power amps had the same grounding scheme before the mod. However, only one of them hummed. So his theory cannot be true at all time.
From a personal experience, the theory one learned at the regular University EE program has very limited areas of application in real life. In the MS and PhD programs, one would probably learn that there are other ways of looking at the same problem, and a theory/equation is only valid when certain assumptions are true. One challenge in real life is finding out which assumptions are true. :-)
This is why I want to solicit opinions from others who have experiences in this area.
The Jensen paper may be technically correct. But it may not describe all real life scenarios. Take Figure 1 in that paper as an example. It tried to explain the hum voltage potential at the power amp and suggested that it would cause hum. This may well be correct. But both my power amps had the same grounding scheme before the mod. However, only one of them hummed. So his theory cannot be true at all time.
From a personal experience, the theory one learned at the regular University EE program has very limited areas of application in real life. In the MS and PhD programs, one would probably learn that there are other ways of looking at the same problem, and a theory/equation is only valid when certain assumptions are true. One challenge in real life is finding out which assumptions are true. :-)