All routers generate noise and RFI. This can be passed to the audio system. The amount of RFI thru the service provider is very high.
A linear power supply can lower the noise floor by replacing the very cheap supplied wall-wart. My router is plugged into a Brick Wall PC and the increased clarity through my CAT8 is without a doubt audible.
A linear power supply can lower the noise floor by replacing the very cheap supplied wall-wart. My router is plugged into a Brick Wall PC and the increased clarity through my CAT8 is without a doubt audible.