Rerurn to Romy the Cat's Site


In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: From beginning?Posted by Romy the Cat on: 7/13/2012
fiogf49gjkf0d
 manisandher wrote:
Well I can pretty much replicate the sound I was getting last year - simply have the DAC and power amps plugged into the PP and the PC plugged into the wall socket.  The sound becomes brighter, thinner and more edgy. This is eliminated immediately by switching to battery and taking the power cord out of the PP. This effect is consistent and repeatable - I tried many, many times to be sure. I suspect that some sort of ground loop is introduced via the USB cable linking the PC to the DAC when the PC is connected to the wall socket, but who knows.
 
The fact of connecting everything to PP is valid but what you describe ALSO an indication (at least to me) that your system is not organized properly from perspective of grounding. If I do not plug everything to PP and live a few elements outside of PP then I will have “some” worsening of sound but it will not be nearly as dramatic as you described. From what you describe I conclude that you have ground loops regardless of the PPs and the PP juts highlights the problem.
 
I run single-ended playback, it means no symmetric interconnect and negative lead of the interconnects is ground. All my power using playback (21 elements) has ONLY ONE connection to ground, from the chasses of my preamp. There is absolutely no explicit path from individual components to ground, only via interconnects to programs and then to ground in a single location. So, if I unplug any single element from PP and plug it to wall (via ground lifter only) then I will have “some” brighteners, thinner sound and more edgy result but it will be VERY minor… That what you had to do from very beginning and then you would not be “wasted a year”. 

The Cat

Rerurn to Romy the Cat's Site