Just listened for a while with my HE400i and HD58X headset, comparing with an LG G7.
For HE400i, the Macbook performs much better, due to the fact that LG G7 fail to trigger its high impedance mode.
Even when I use the trick to enable Line-out mode (1V RMS), the sound is more solid and pleasing...
Powerline modems are very unreliable. They produce heaps of interference, and they are also prone to any interference on the power line. Wireless Mesh could be your way to go, depending on your situation though. What's your normal throughput via the powerline? I once believed that powerline is...
Just received my DA-9 to pair with Polk S10 as my PC audio system.
DAC is Musiland 03 Plus connected via RCA.
I can hear interference noise if I set volume of the DA-9 above 45. It's likely come from my DAC but I'll need to isolate the source.
In my daily listening, I don't need volume above 35...