Am I Killing My Sound?

I am running my system through a monster power HTS 5100 conditioner.    Will the monster power fool me into thinking it sounds better?  

Also, I am in the middle of an upgrade, I ran an 8 AWG four wire copper Romex from the main panel to listening room. Was planning on running 2 120 volt circuits.  So you have 240 volts across both hot wires even though I am not using 240 volts, this splits the current on the neutral.  

• Do I need to worry about noise because I have 2 separate phases running from the panel to the listening room?  
• Do I need to be concerned about running mono blocks on separate phases? 
• If I want to run single phase in the listening room what do I do with four wires in the romex (black, red, white and bare). should I run double ground wires?

System;

Rega P8 with Apheta 3

Audio research LS26 pre

Audio research PH8 phono

Cary CAD-211 mono blocks driving Tyler acoustic D10’s

Lamm M1.1 mono blocks driving Wilson Sophina’s

Also some digital Mcintosh gear for TV and movies and Runco plasma TV

Thanks!