Outlets and Wire Gauge? - Please help!

@jea48 I live in a split level ranch, so the panel is on the bottom floor in an unfinished room used as the laundry room. It is quite large. The adjacent room has the oil burner, two tanks and shelves of storage. The metal jacketed cables will be run through the floor joists and through a hole to be drilled through the concrete wall. The boiler room is under the garage and is concrete on all sides. My audio room is behind this room. 

Left side of the panel has seven free slots with only one left on the right (20 per side). A new solar panel system has a double breaker in the bottom two slots on the left side, so the free seven are directly above this one.

@raysmtb1 My last sentence is not a statement, it is a question. A question based on a great deal of reading and videos demonstrating how sound can change over time from an outlet. I have seen and heard too much in this realm to not discount claims that an outlet too will change the sound over time. 

Best, and happy listening!

@izjjzi sorry if I was being a little rough last night. I think I blew a gasket after reading so much bad information on the this forum. The only way that I know that an outlet can change over time is if a vermin chews through the wire feeding the outlet. Many of these threads end up leaning towards the science deniers because the people arguing for science tend to get their comments deleted. I think it’s probably because they can’t believe what they’re reading and lose their mind and maybe should’ve not used a derogatory word or two…either that or, the science crowd doesn’t have a way of putting money in the forum owners coffers, like all of the manufactures of this junk do. Please accept my apology.

@raysmtb1 No need to apologize. My degree is in science. I am all about science but things exist that I cannot explain or measure... When all things seem equal in terms of materials, why do I hear a difference? Why do things change over time? I stopped looking for reasons and have accepted it. I hear it, I accept it. I ask those who have been around these things for a long time. I do not take anything as fact. I rather make note of it for reference and compare them to my experience. I have learned that I can get a pretty good idea of what to expect from asking, and so far it's been a reliable approach. 

One example is with the Fleetwood Sound Deville SQ loudspeakers I just broke-in. The dealer told me to put 150 hours on them, so I tracked play time and and made notes along the way. I would listen to the same two tracks and note my observations. I noticed a huge change around 47 hours. When I was just 3 hours in, I posted my initial impressions and asked other owners for their feedback. The first reply came around 70 hours when one owner wrote, "I noticed the biggest change at 50 hours and only minor improvements continued from there." No, it is not a scientific study, but in this hobby it's good enough for me. Justification from someone I never met who didn't know what I had experienced at 47 hours. 

My goal has never been to debate these things. I am seeking the best possible synergy because late night music is my escape. I want to be drawn into the music. I want the vocalist to be in my room. I want their passion to give me goosebumps. I have this now and don't want to mess it up with this change. I want to do everything right based largely on other's trials and tribulations.

The best part about this thread is only paying $22 for two outlets. Not one salesman or "pinky in the air" person chimed in claiming I need to spend hundreds of dollars on brand XYZ, "or else!"