Symptoms of UN-CLEAN power

I don’t think I’ve posted to this thread yet. Stop me if you’ve heard this.

I’d start at the meter. Your power company can pull it for you. Are the contacts corroded? What kind of wire runs from that? What is your feed from the street "transformer"? Who are you sharing it with?

What does your main service panel look like? You can pull dedicated lines from it but I’d first check the power coming into it.

I ran a sub panel, once I sorted the main service panel, and took 60 amps for the system, far more than needed, for a big-assed iso transformer. That outputs via 4 gauge to the panel adjacent to the room, from which I’ve pulled a number of dedicated lines, using 10 gauge and Porter Ports. System sound fine.

I listened to it with "dirty power" vs. the iso transformer installed. Didn’t hear much difference. Frankly, the system sounded a little bright at first, but it could have been all the new wire. Or I adjusted to it. I changed cartridges, which made a big difference, but if you are concerned about "clean" power, don’t approach it with after the fact band-aids, sort the basics first, starting with the quality of power coming into your place.

@kraftwerkturbo it’s hard to tell whether or not your system is affected by the “dirt” in your AC.
There’s a lot to consider including power supplies and even the crap your digital components throw back into your power. Add to that appliances, etc.

Only way to determine if a power conditioner will make a positive difference is to try one. Running your source components into a power conditioner would almost always improve the overall noise floor. Amps are different beasts and I prefer running my amp direct without power conditioner.

I use Puritan PSM156 and it does help in reducing noise floor resulting in quieter background and therefore more details. It does help slightly with my amplifier as well when it comes to reducing noise floor albeit resulting in a slightly less dynamic presentation. So I run my amp direct. 

I had all of the sound issues listed in above comments plus my house is old with 2 phase, ungrounded circuits. I purchased a fairly inexpensive Panamax conditioner and the previous grounding problems (slight current running on metal faceplates, sounds scary) was eliminated and background RFI noise was eliminated. I did pop for an Amazon upgraded power cord for my amp (about $25) and that seemed to help with some detail nuance. 

We are in the process of remodeling and I plan on a major electrical upgrade. I may spend the extra for a dedicated 20 amp circuit for the listening area.

If, A) is to install a dedicated circuit. And, B) is to purchase a conditioner to clean up the AC on the said newly installed circuit, then it would seem to me that, C) is to skip A, and go straight to B. 

I put little pieces of tissue paper on the ends of everyone of my interconnects and power cords. Then once a month I go through and I change them all out and collect all of the dirt that’s in my AC power. It’s kind of like once a month I wipe my systems’ butt.   Makes a huge difference, give it a try…… I feel like I’m really using my head…_