Ethernet over power line - noisey?

I use it in both of my systems and I am unaware of any audible effects, even when I turn it on/off/on.

Kal

I use it for audio - a NAS in one room with one adapter, another to a Mac Mini connected to my DAC. I did get some network lag at times, which required some network tinkering (prioritizing traffic between the two powerline adapters in question, as I have another elsewhere, which helped a lot). I also use software capable of memory playback to minimize whatever is left. I'm very happy with the results.

I do not use it for audio, but do use it for DSL, and it has no audible effect on my system.

Sometimes "power line" products can cause problems for audio, especially if you have a good system that shows flaws easily. I also think that grounding issues can become an issue. While I don't usually recommend power conditioners, sometimes when dealing with poor eletrical issues, they can solve some problems.

Network data is delivered in packets, so the problem is probably not with the data signal, but from the electrical and mechanical interference.

What devices and DAC are you using? You might want to just use a wifi router and extender to get data to the area, but wifi connections can also have problems depending on how you are using them.