Thanks all for your helpful replies.
#Powerline: I am deeply suspicious of sending computer data through the powerline. That's not so much because the data may spread outside of your confines, but also because it is a strong polluter of mains networks in the HF domain. At least this HF noise will affect power quality in the neighbourhood. That's the reason why some of us need strong power conditioning.
#Spark: I was not aware that Spark is also a music player that can be used in place of e.g. Roon or iTunes. I am not streaming very much, though.
#Powerline: I am deeply suspicious of sending computer data through the powerline. That's not so much because the data may spread outside of your confines, but also because it is a strong polluter of mains networks in the HF domain. At least this HF noise will affect power quality in the neighbourhood. That's the reason why some of us need strong power conditioning.
#Spark: I was not aware that Spark is also a music player that can be used in place of e.g. Roon or iTunes. I am not streaming very much, though.
