Dedicated lines

When running dedicated lines, should I be using romex single solid core cabling or a twisted pair of stranded cabling? My electrician has recommended a hospital grade cabling that he is recommending I use for running new dedicated lines.

First in reply to the questions/comments about hospital grade, I spoke in more detail to my electrician. The power cabling was NM/MC, which means it used non-metalic wires (no aluminum, etc. . . purer copper - so to speak). Secondly, the MC stands for metal shielded (everything was run inside a metal conduit for shielding purposes). At least this is what my notes indicate from my conversation, which does not rule out the possibility that my abbreviations may be incorrect.

Secondly, looking for feedback from others who have upgraded to dedicated lines. Did you notice any changes during the burn-in period? When I first hooked everything back up, I found that my sound had worsened actually. My bass lost a far amount of tightness and focus overall was negatively affected. This is what lead me to speak more at length with the electrician. I ran my system for a straight 24 hours (and also moved my speakers slightly) and noticed a significant improvement after just this 24 hour period. Since I moved my speakers a couple of inches, it could be JUST this, but I doubt it.

Is this in line with what others have found?

What was installed, based on my reviewing the runs, was inside metal conduit (which i believe is code in my area considering how it was run - semi exposed in a "crawl space" ceiling. There were 3 wires + - ground.

You are right though, that I could have very easily been confused as to the NM/MC as we/he discussed both during my conversation with him.

No, three wires total, one plus, one minus/neutral, one ground.