Something has changed since last time I wrote (October 19, 2013) with that grunge that was generated in my main speakers each time I was turning the subs ON.
For personal reasons I disconnected all my things last February and did not use my speakers and power amplifier until yesterday.
Just to recapitulate:
- I had a ground loop problem last year and the only way I could get rid of it was by lifting the power amp PE.
- But after doing this, another "grunge" noise appeared in the main speakers and to my dismay it was coming from my 2 subs when they were ON.
- Each of these 2 problems was in opposition with the other... Putting back PE on the power amp was removing the noise coming from the subs, but the other ground loop noise was back...
Yesterday (April 10) I reconnected everything together, leaving the power amp PE lifted and... I don't have either noise anymore !!!!
So I wondered what could have changed since the last time
2 things:
- I removed the iFi iUSB powering my external SSD drive because it cannot power a new SSD that I have now. I have put back the wall wart that came with the iUSB power supply.
- I have isolated the Silverstone USB 3 PCIe controller card AND disconnected the NOS1 black wire (http://www.phasure.com/index.php?topic=2838.0)
As for the electrical circuits, they are the exact same as they were before.
So, I am not 100% sure, but if I had a guess to make, I would say that the isolation of the USB connection from the PC chassis and the disconnection of the black wire in the NOS1 could explain this.
I will probably do some tests in the following times, but it sure is a happy conclusion
Alain