I added an LPS to my main xfinity modem/router which is located in another room from my main system. Also, I added another one on my mesh router that feeds my main system’s streamer. My streamer also has an Lps built into the unit. Did the Lps’s make a SQ difference? I don’t know, I did not do blind A/B comparisons and have no plans to. It certainly didn’t make things worse. My goal was to reduce noise in the A/C lines. When I added an Lps to a prior streamer (ifi Zen Stream) it made a noticeable SQ improvement. Really depends on the device and what you want the Lps to address.
Power supply to modem make a difference?
Currently using the SMPS that came with the Xfinity modem. Has anybody noted that a different brand or design makes a difference?