Anyone have the Answer?

" Any equipment with a decent regulated power supply will reject any noise."

So far, pretty much the only statement which makes sense here..... Rest is all snake oil.  Most noise & RFI is filtered out in a proper power supply.

That is what a power supply is for....... as well as also providing a low ripple DC.

The only downside of an unregulated power supply is that it will reflect the voltage variations of the mains on the DC line.

Thanks for even more good ideas to try!
The baking analogy is something that hit home.

Some clarification please:

1. If I try an excellent power cable to my Streamer or Dac or AMP-
(Which first? The DAC?) and I find I hear a very noticeable
improvement, is that telling me I should start with an AQ/Furman/PS Audio/Shunyata or ? conditioner/regenerator first
or buy better cabling/inters?

I read of those who tried conditioners  and felt the soundstage was negatively impacted. 

2. If I flip all breakers off except the two going to my system
and that produces a very noticeable improvement, does this tell me
I need a regenerator ?? Or just install a new J-box and cut off the
wife when I listen?

3. I am beginning to see which direction to go. I am no E.E. and 
the thought of comparing sine waves leaves me woozy.

Thanks for all the various approaches.

Best,

Jeff

Based on posts here, I'm checking into the Puritan line......very interesting.

@chorus,
Check out Danny Ritchie’s videos (GR Research) on cable building. Very enlightening.

Planning a visit to Danny soon. 
Thanks!