When I built my new house I told the electrician to put higher grade wires, separate paths & such into my proposed listening room. I got PS Audio receptacles from one of the audiophile mail order sites. The electrician looked at them with amusement but gamely installed them. Did it all actually improve things? Because I have no verifiable "before" for my "after," I have no idea. All I can say is that the components I moved from my previous house did sound significantly better in the new digs.
Other factors affecting sound
I'm building a dedicated room in my basement and was wondering if I should care about in wall electrical wiring and Receptacles. Do these generally make a big difference. I assume anything should be better than builders quality material. Are there any specific recommendations? What about whole house surge protection? Also, I have an option to install a second electrical box, is this helpful? I have a 5000sq ft house in suburban area with very few houses near me. I have clean and stable power. Recommendations appreciated.