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I have had variable power voltage and variable noise for years, sometimes pretty good, and sometimes not. Usually it runs for longer periods of time rather than day and night being starkly different (like many seem to suffer). I have my own transformer here, but it shares utility power with 16 other homes and their individual transformers on the power company "loop" that covers our road.
I am using three power "filter" setups, all of them fine tuned with some better parts and having really nice cords feeding them, those cables fine tuned for the work too. Those that were not purpose built and therefore tuned to musical transparency made the originals a lot more resolving, fast, and musical... and the benefits add up.
It starts with a Mapleshade receptacle, not in your face bold sounding, or warm, or anything (like many audio plugs), but the most transparent and resolving receptacle I have tried here. Then there is a 500 watt Chinese production balanced power supply that is really nicely made. The balanced transformer feeds a PSA P5 used mainly for amps, but a few other things. I got it for voltage regulation, the specific voltage really effecting the sound of my Decware amp's tones and densities, especially if the swings are more than one volt, or if the voltage is running high, like 123. I have an Audio Brickwall straight into the Mapleshade receptacle for sources. I also have some mineral noise adjusters scattered around, and built into cables, and a couple filter plugs, one Shunyata for sources, and one Furutech in the P5.
None of this solved the transformer noise from my Decware, improved in some cases, but more effective here was putting properly tuned-to-sound caps across the AC of the amps.
That said, I don't think this place is that bad in terms of negative sound from noise other than transformer noise... Back in the day anyway, it sounded pretty resolving without any of my power treatment relative to transparency and revelation. But it all helps when fine tuned for sure here. Especially in subtler areas it is notably better at allowing the finer nuanced information, and with stable/selectable voltage and phase from the P5, it leads to consistent and nicely tunable sound.
For periods (like now) I can hardly hear transformer hum except near the amps, and a little in the speakers with ear right there, but really not an issue for me. But sometimes, it can get loud enough to bug me. Probably hyper sensitive as it never seems bad enough to do notable damage to the musical experience, but in these noisier periods, for movies where the amps are almost maxed, during silence, I can just pick it up at the seat... irritating to me.
I have had tubes, and ground loops effect noise too, so it can be a pain to sort. But speaking of ground, I have been thinking my noise variability is perhaps largely due to dryness! I live in high desert also, and if the ground rod for the house gets dry, it seems then my noise can go up, sometimes notably. It took me a long time to consider "watering" the ground rod area as a first step, but I started to notice that in drier periods with the nearby hose bib not leaking, if it rained or snowed for a spell, or if we had a leak at the irrigation bib, it would seem fine.... Not conclusive, but I think a good guess, so I need to test the theory next time it gets more noisy... start by watering the ground!
It may be this power and room, but I have a number of shielded power cables and a number that are not, those not shielded having geometry and passive filtering designed for noise cancelation and some RF/EMF protections. Last time I tried, I could not hear notable (noise) differences between these "unshielded" and shielded cables. I don't doubt some rooms might need heavier atmospheric noise shielding, just not my experience here, and I do have wired internet, with ethernet to fiber to ethernet filtering... no wifi in the house knowingly.
I have not explored 12 versus 10 gauge on an independent line as this is an adobe house and hard to add hidden wire runs. Also seeming to have pretty good power relatively speaking keeps me lazier. And my power cleaning setup has gotten really good!
But one day I expect I will try to make a 10 gauge cryo'd dedicated run... leading me to.....
One thing that occurs to me reading this thread is that it seems perhaps a little more focussed on decisions based on current/voltage tech over sound?... and these may or may not correlate. I have explored a lot of cable designs, and gauge always influences the sound whether ICs, power cables, or interior hookup wires for amp power or signal... all with my low AC power consuming system and gear.... I am miles from combined gear rated specs even approaching my audio plug's wire gauge or receptacle specs...
And this is not to say 10 might conclusively sound better than 12 gauge... but it implies to me that it could, and that it likely would effect the sound one way or another even if way overkill for AC current and voltage. Better or worse sound, can't say. With power cables I have made, a little too big gauge-wise, and all else the same, the sound gets thicker and darker. Too light gauge, leaner with less punch... And right in the middle is always a nice balance all round.
But why would I use 10 gauge here??? A guy who I learned a lot from over time has some of the most refined and discerning listening methods and skillsets I have run across, and he has heard and set up lots and lots of high end gear and systems (one of the Tranquility DAC developers). Last I asked him, he preferred 10 gauge cryo'd for a dedicated run... He AB tests everything before making assumptions or declarations, usually many times, and typically gets corroboration from his small clan of other audio heads he trusts to hear balances and subtle information exceptionally well... As far as I know he too is not close maxing out the ratings for 10 gauge runs. Just a little more for the thought pot.
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