Higher End DACs

Heaudio123
It's worse than you just galvanic conduction of RF.  Even with optical from server to DAC, you can tweak the server to change the sound. Why? Because the RF conducts along the metal AC power cord to the wall and to the household grid. You then have a room sized mesh of metal to contend with. Also the phenomenon plainly affects DACs across open air. 
If I have a RF analyzer at the output of a DAC and just power on a disconnected NUC 15' away,I can see the MHz,GHz noise that varies as the NUC is doing it's thing.
So ...distance  battery power and optical are the factors to focus on. And as you say,lower power helps and your mention of a Faraday cage is on the right track to an objective solution. 

And despite the resistance, ll keep working to break the spell that so many are under. 

Reading some of these comments relative to streaming makes one's head spin. Do you actually sit down and listen to music or just worry about all of this technical stuff. Glad I still spin cds.

facten

Reading some of these comments relative to streaming makes one’s head spin. Do you actually sit down and listen to music or just worry about all of this technical stuff. Glad I still spin cds.

Streaming is not nearly as flawed and complicated as some here would suggest. Consider that one of the contributors is trying to define a "problem" for which he sells a special "solution."

@headaudio123 : you are clearly AtDavid. Why did you change your moniker ?

+1 @cleeds 

Reading some of these comments relative to streaming makes one's head spin. Do you actually sit down and listen to music or just worry about all of this technical stuff. Glad I still spin cds.

To reinforce what Cleeds shared above... IF others are taking away a similar message to @facten 's post:

Streaming is straightforward and easy enough.  As an example, no issues with my 100% streaming system. Music is on 12 to 14 hours a day. No hiccups.