Having a multimeter would let you test, if that NUC PS indeed has a protective earth to output ground connection, possibly causing a ground loop.
By the way, your ordered PS also has a three prong AC connection.
In almost all cases of such SMPS’s, there’s no protective earth to output ground connection, but there’s a power input side line filter, that absolutely needs the protective earth connection to properly work - that has nothing to do with user safety, but EMI emission regulations.
In my above described case, there was NO ground loop inducing the noise. It was the silent PC’s internal voltage regulation circuitry causing the problem, and the Intona properly, galvanically isolated that.
There, the usual culprit of audio ground loops is - that’s, why I explicitly asked!
Now, if the TV has an antenna cable connected to it - and one of your components has a protective earth to signal ground connection, which many power amps have - that causes the dreaded ground loop, because it draws earth from a far distant point to your AC outlet earth, causing voltage potential equalization currents.
So, have you also tested with antenna cable removed?
I should’ve also made it more clear you, to only connect the bare minimum amount of components to stream Roon while testing for your “hiss”, so leaving out any ancillary componentry like TV, step down, what not…
I don’t know how those Mean Well SMPSs are built, but for me they’ve been noise-free powering digital sources (Pi-based) plugged into a variety of DACs.
@Fernando_Pereira@Marin_Weigel
I am not too optimistic that MeanWell power adaptor will eliminate the hiss sound… as the origin of electric circuitry noise is from Intel NUC
How did you conclude that? It’s possible, as @Marin_Weigel explained, but switching power supplies/regulators/grounding/main power can interact in a wide variety of ways. The only reason I suggested the Mean Well SMPS is that they are built for medical uses with some attention to residual noise.
From what I read few feedback from Intel NUC users at forum intel, like this one @Fernando_Pereira
but hopefully that’s not my case. My Intel NUC has worked flawlessly for nearly 18 months. Since I upgraded by amp to Accuphase from Krell, I observe this hissing sound.
I have a quick check on my Intel NUC 8i5BEH, there’s BIOS update rolled out last year October, do you think I need to update BIOS UEFI ? Not sure will the update reduce the electronic noise a bit?
My Intel NUC is a dedicated 24/7 Roon Core, no other application except streaming music.
When I installed my ROCK in Intel NUC 18 months ago, I have updated BIOS during that time, do I need to update to latest BIOS and follow the following instruction again ?
All my 8 gen NUCs are running 0089 bios without issue (I actually didn’t realise there was a 0090 but after seeing that post I won’t update - mostly because it isn’t needed)
So I think you can safely update to 0089 without issue - although I’d be amazed if that helps with your problem.
Thanks for your advise and suggestion. My ROI from Intel NUC yet to achieve, let’s see the new PSU that I order if it will help a bit to reduce the unit noise. Will consider R-Pi only after NUC kaput.
Right, at least I found the culprit after a long trouble shooting, thanks to this good forumers assistance. Hope the new switch mode PSU will help reduce the electronic noise. The PSU is on its way from UK, will take around 6-8 weeks to deliver.
@MarcMarc Do you have Raspberry Pi setup as Roon Core or Roon Bridge ? I read Raspberry Pi is not compatible and one still need a mini PC of Window OS/ Mac OSX or Linux as Roon Core. I already have CVN X2 thus I do not think i need another network media player.