It cost nothing...I was lucky all that was already done in my new smaller house...
I was in the obligation to sell my larger house...
My system there was connected to a secondary electrical grid on the second floor..
The sound quality was impacted negatively, but i never realize this ...
I had been conscious of this only on my new house...
My audio system is near the main electrcal panel in the basement...The improvement was noticeable at the first minute of listening...
I will change the wall plug and all will be done for the best...
Another great improvement was using a small battery dac... No connection to the grid or my computer at all... Save the amplifier on the direct main panel line ...
@mahgister how much was it to do that ?