Dedicated 20 amp lines/should i use a sub panel

How far away is the main panel from your listening room? If it’s more than 50 feet then it pays to put in a subpanel since a branch circuit of that distance will have a high voltage drop (3 volts with #12 and 1.8 volts with #10 at a 15-amp peak draw).

If distance is not an issue, use 10/3 romex because the wires are spiraled and that reduces common mode noise. Cut the bare grounding conductor and use the red wire for ground (tape it green where exposed, of course). Also, use the clamps under the screw of the receptacle for #10 wire instead of looping it around the screw. And use 10/3 from the subpanel to the receptacle also.

Jim,
Thanks. Correct - that’s how I received it from the seller. Not sure if Stu R. originally did that or if it was the seller. As the REL is fine and grounded, the hum loop may be from the monos. I dunno. The Croft preamp has the safety ground intact as factory supplied. The 401 is also grounded. Interesting notes on the steel plate. However, I’ll definitely try it on the DIY 4 duplex receptacle unit if I can buy one in that size. Thanks for your help and apologies to the OP for going a little off-topic.

Thanks everyone, i appreciate the info. i guess ill forget about the sub panel as it seems like there is little to no benefit by adding it since the 3 runs will all be under 50 feet and i'm not going with an Equi=Tech as much as i would love too.

noromance,
No apology necessary, i'm enjoying all the different opinion's and just absorbing all the info.