Is the output of ONT fiber optic or copper? Is the SMPS on the same circuit as your system? I could be wrong, but if the SMPS is not in the same outlet or even circuit as your audio components, replacing it with LPS is most likely not going to make a difference. Also, if the output is fiber optic, the light carries the digital signal and as such it is not susceptible to EMI and RFI - there’s no noise in that transmission line. Once you convert fiber optic back to copper, that’s where I’d start cleaning things up.
LPS for Optical Network Terminal (ONT)
We have fiber coming into our home with a Nokia ONT/Router combo and I want to add a LPS for streaming. The ONT presently has a wall wart providing 12V, 3A to power it. Can I just splice in a standard US NEMA plug to the existing wire for connection to a LPS, or, do I need to purchase some specific wire (which already has an ONT connector) to go between a LPS and the ONT ?
I know this sounds extremely simple but I just want to make sure the rewiring doesn't screw things up due to my overlooking something obvious. I can be very good at overlooking the obvious 😥
Thanks for any insight,