Don't try to fix these electrical prolbems with a conditioner!

@goodlistgening64

Consider the case of a missing ground wire.  This is not an audiophile issue.  This is a life safety issue.  If your outlet is 3 prong, and the ground is open or missing, or swapped with the neutral a basic safety feature of your home and equipment has been disabled.  this is true if you are using an integratd amplifier or your clothes washer. 

So this is one example why I’m not really talking about this as an audiophile issue.  It’s an electrical and life safety issue and finally it may ensure your system behaves well. :) 

@erik_squires  another one to add to your list is checking (or have someone with experience help) all the connections on your main panel.  I don't know why this happens, but it not uncommon to find screws on breakers, or the neutral buss that need to be tightened.   Cheers.

I will add another thing to take into consideration.

"THE NEIGHBOR'S"

Trace your power lines from your utility meter back to the transformer and see who else is connected to the load side. If your lines are above ground this is easy but if they're buried or you live in an apartment you'll have to guess.

I live in the city and for a couple of years we had a hobbyist welder renting a garage which you guessed it was sharing the load side of the utility transformer with a few houses. Every time he would start welding, anything plugged in capable of making sound would squeal and pop. All us neighbor's complained so much the utility eventually put that property on its own transformer. Before that I tried a few of the things mentioned in this group, within my limited budget, to no avail.

Moral of the story, don't assume the problem is yours.

Hey @mikenike80s 

See this is exactly the problem we all have.  Audiophiles think they get a dedicated line from the power company to their panel and they don’t.  Lots of external factors come into play. 

While I absolutely don’t recommend fixing bad wiring issues in the home with a conditioner, I would rather have a power conditioner with voltage regulator like this one than to rely on a dedicated line. 

From years of watching my AC voltage fluctuate in apartments and my home, I know the biggest factor in having a stable AC voltage is everything going on outside AND how my HVAC is operating.  Perhaps a dedicated line can reduce some noise, but it's not going to solve the neighbor problem or the HVAC problem. 

I would like to ad something I experienced that might be relevant. I have a 35 years old trac house that is fairly nice build , but I did find exceptions. Decent Supply panel and appropriate gauge copper wire and decent grounding  including multiple earth ground rods. However  the inside was finished with subpar duplex outlets. I replaced my outlets and added Hubbell medical grade for my stereo and 3 TV’s. Over time I had a GFI circuit in my wet bar that had my lights dimming when I ran a high current hot water heater. I checked the panel and all was good. One day I was working on my pool and at the time had an older single speed pump motor. I heard the motor going on/ off , on/off in short spurts. I went over to the panel and could hear very slight intermittent arching. Long story short , I had tired breakers that would trip easy or not hold full load. The 40 amp breaker for the pool had pitting on the bus bar. I moved  that breaker location and installed new breakers on most of the circuits and ensured everything was tightened down. My service panel is on the west side of the house and cooks in the hot summer sun. Two years ago , when I had solar installed , I requested to have a new service panel installed. My point is the average person does not think of this as a wear item and never inspects. My senior neighbors had their panel let go one day with a violent event and we’re fortunate to not have a house fire. It’s my understanding that this is greatly complicated with aluminum wiring. Also over the years I have encountered low voltage issues that have damaged the controller in my air conditioning. Most of you are above my pay grade , but some just don’t know   Cheers , Mike B.