Can moving wire location at circuit breaker reduce hum?

Another question, do you use LED lights on a dimmer switch? Not sure why, but I’ve issues when I used an outlet on the same circuit for a HT receiver.

I have used modern dimmers without a problem, but the older LED power supplies were awful.  The problem is they would only take power from one direction of the AC signal.  If the AC signal goes to +140 V and turns around and does -140V, and you have relatively high impedance on the wiring then you suck down one side, making it +135 to -140 and voila, DC.

OP: One other thing to consider is, how old is your house?? If those are older outlets or using back-stabbed connectors they need to go.

You can get good commercial grade / tamper resistant outlets for ~ $4 a piece.

So far in this 17 year old home I've replaced 28 light switches and about 20 outlets, including 7 GFCI outlets.  Given how many issues I found I'm glad I did. 

So I just looked online at a couple of DC blockers.  You have to be careful as the two I found were rated for 7 A or less.  If you are using monoblocks I am going to guess you are going to easily exceed this. 

My recommendation that you need to have your power evaluated by a pro stands no matter what.

If you really need a DC blocker, Audio by Van Alstine has a good one, and they allow returns.

The current culprit is a Marsh amp.  Lights but no dimmer switch.  The house was build in 2001 but I upgraded the receptacle with one of the audiophile-approved  Randy’s about a year back.

I’ve always had a problem with this room and initially thought all my gear was going bad until one day, on a whim, tried a component in another room.

One of my daughter’s friends is an electrician.  I’ll probably have him look into it.

Thanks, all.

Cheers,

Mamoru