I also got sonic improvement by turning up the voltage from 117V to 120V.
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I'm either loosing my mind again or there is a DRASTIC difference(in my system)by upping the voltage to 120V from 117V. Before I changed the voltage setting my sound had an artificial sound to it which I attributed to the P500. After living with the upped voltage on a setting I find tends towards slightly bright with the P500 I decided to keep the voltage at 120V and change the P500 Multiwave setting to the most natural setting the power plant has to offer in my system and now I'm so excited that I had to write this comment on this post. I am using a Shunyata King CobraV2 to CDP which from day one seemed to slow the sound down very much but with the recent changes in voltage I'm happy that my system sounds the way that it does. Full but tight bass(I did not know one could get both these attributes at the same time),mids that are smooth without grain I can detect and the highs are delicate but very detailed. My system has never ever sounded so natural and yet with tons of dynamics.I know I have a whole lot to learn and peoples comments and advice would be greatly appreciated.