Missing something? Probably yes, a lower noise level. Depends how good are your power supplies in your system and how much noise filtering are they doing. I don’t see what difference can make the power cord, the noise still goes through.
In my case I use a Furman PST-8DIG and I clearly noticed complete silence under no load using Marantz SR5008 and 7008 receivers. Plasma TV is making way less hi frequency noise. The filter inside is working even if doesn't look more than a power bar.
In my case I use a Furman PST-8DIG and I clearly noticed complete silence under no load using Marantz SR5008 and 7008 receivers. Plasma TV is making way less hi frequency noise. The filter inside is working even if doesn't look more than a power bar.