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The linear power supply on my Node 2i reduced the noise floor and it sounds better. Like going from LCD to OLED TV. Things "pop" more.

Honestly I didn’t hear any difference between $850 Cardas power cable and $350 Cardas power cable on my Lumin D2, but I was using those cables with Sbooster power supply. Probably, using them with onboard PS will make some audible difference. 

I put a $300 Audience pc on my Node N-130 and it made a difference. I added a Teddy Pardo LPS and it got even better and when I put the Audience pc on my the TP power supply it was better still.

Placed an all copper cord and plugs on my lumin U2 mini, and I think the sound is better. Better more definitive bass. But not a ridiculous amount. My aftermarket power cord was $300.

A decent power cord makes a difference Everywhere even on my new modem- router combo motorola 8702 which btw has the latest docsis 3.1 

IHave a LPS on it horrid of the crappy $10 power supply  an aftermarket Pc absolutely gave this better grip and detail 

for the $$  Pangea their top cables like the awg14 SE MK2. For$200

using Cardas best  Copper is a very respectable cable , I use these on all my LPS ,

and dac, their monster AC9-SE  isa awg 7 cable for line conditioners or power amps for under $300 prettygood. Fora real good Pc under $1k tops for myself .

many companies selling power cords even $5k which iam sure great but that’s pretty steep.