@jea48 thank you for the added input. A couple of things with a question(s) added:

About my breaker arrangement on my panel:

I typoed again in previous post. There now are FIVE breakers on the leg I used for the 3 circuits I just added.

From the top working down

1) I discovered what the unknown breaker was for. The washing machine. Which I assume is a pretty hefty draw? However, I am relatively confident that the machine is usually not in use when I am listening. So that should be good?

2) In my previous post, I said "TWO of the three original dedicated circuit breakers were on that leg"; in reality, only ONE of those breakers is on that side, and when I finally reach completion up in the attic it will be very rarely in use. So that should be good? If not, I can turn that and the washing machine breaker off when listening.)

3, 4, and 5 are my for the new and truly dedicated lines that I ran directly from my outlets, up the wall, across a section of the attic, and down into the panel.

Besides the sub-questions I raised above, 1) would you say that what I have described make that a pretty good leg? 2) Especially if I turn those other two breakers on the leg to ’off" when listening? 3) And is there any need to do that if those circuits are not being used when listening? 4)And would there now be a need to move my three new breakers down?

(I guess that was more than one question.)

On the outlets: thanks for providing that, and I actually did buy some of that brand at Lowes.. I know because I have a n extra one. The back strap is magnetic. However, I also have them mixed & matched with another brand Lowes sells (I don’t have the box on that one), and it has a magnetic back strap as well. I am pretty sure that they are different brands as there are small differences in their construction. I can easily go to Lowes & finish up this job by buying all one brand.

Anyway, thank you for your helpful input.

@immatthewj wrote:

The duplex receptacle came from Lowes and were therefore nothing special.

I have had good results with the plugs below for audio.

Mike

Trying to parse from this thread so will pose a question which I hope is sufficiently related so as not to hijack. I am building a dedicated room over the garage from scratch—only drawings at the moment of a new structure. I plan to install a sub panel in the garage fed from the main panel in the basement of the house. The sub panel will only power the audio room and maybe the adjacent office space. I want to install 3 separate 20 amp dedicated lines in the bonus room, each on different walls. One will power 3 outlets between the speakers for amplifiers. One will power a box with 3 duplex outlets for the rest of the components in this system. One will power a box with 2 duplex’s that will power a second system in the room.

I’d welcome comments on wrongheaded thinking AND suggestions to minimize noise, hum, etc. 

Just want to point out that the Eaton 20 Amp and 15 Amp outlets are identical internally. A good thing.

However, only the Commercial/Residential outlets are tamper proof, now required of residential outlets. :)

My experience is the Commercial/Residential are really good, ESPECIALLY when mated to a hospital grade male plug.

@ditusa thank you for that. There is a Fastenal store close to where I live that theoretically sells them.

@dodgealum don’t worry about a hijack (which it is not); I have had most of my questions mostly answered. But this type of thread seems to run it’s course fairly quickly & you may not get any more answers on this one. If you scroll down to probably withing the last couple of weeks or so, there are about three more dedicated circuit threads and I remember that they dealt with setting up a new listening room and you may find answers to some of your questions there. I’d post links, but it will be super simple to find them by just scrolling, as they are relatively recent.

And if you don’t find answers there, I think a new thread will yield better results than asking on this thread. (Not that I mind at all if you do, just trying to be helpful.)