You may find yourself wanting the second dedicated circuit depending on what gear you're using. I have 4 dedicated 20A circuits, and 1 dedicated 15A circuit, and I'm finding I could have benefited from having at least one more added. But I'm a bit of an extreme case.
One or two dedicated AC wire ?
Would it have a signeficant audible in performance between: FIRST- a dedicated AC wire for an audio stereo system connected to a power distribution bar with good AC cable and Furutech Duplex. SECOND- the same as first version, but adding another dedicated AC wire, and an other wall Furutech Duplex, to connect only the stereo power amp. Would I hear a significative improvement for the investement of time and electrical parts ?