Anybody use an LPS with a processor?


I have marantz and NAD processors.  Do people use linear power supply boxes to improve performance?
jumia
You really can't upgrade a power supply that's already built into a processor (NAD / Marantz).  However, you can do a linear power supply upgrade for transports and sources.  These are things like Oppo/Panasonic bluray players, streamer boxes such as AmazonFireTV or Android TV streamer boxes such as SkyStream Pro 8K, etc.
Yes, a linear power supply would definitely improve a roon nucleas as well.  This question was actually asked recently and I posted a detailed answer:

https://forum.audiogon.com/discussions/lps-for-roon-nucleus