How can I measure the noise on my AC mains with a 2ch oscilloscope?

Gents your experiences are extremely helpful. I’m using a Core Power Technologies DEEP=CORE 1800. And with my AMT tweeters it’s quieter. But not sophisticated as your solution. I do believe the Honda inverter is cleaner power ! 
 

I’ve heard the same comment from a friend that switched from PS Audio P20 to a Shunyata he never looked back .

i have a High freq current probe for the o scope that I might look at up stream and dwn stream of the power conditioner? 
 

thank you all for your contributions

Bruno 

@badbruno 

Are you really interested in answering the questions posed in your starter post, or are you interested in your system sounding more like live music?

I'm definitely sold on the Audioquest Niagara solution at this point, but Shunyata, despite a very different design philosophy, also makes superb gear.  Just be sure that you deploy comparable power cables on your amplification components.  The conditioner is only part of the story.

Good luck.  Hope I was able to help even a little.

@cundare2 

yes your involvement was helpful and has given me new factors to consider while on this path. And good luck while enjoying your superb system !

it’s been a pleasure have the conversation 

cheers