Oh my - I'm not sure where to start. I designed 100BaseT and 100BaseFX equipment in the mid-90's and there is a very good reason Ethernet signals look analog o

Oh my - I'm not sure where to start. I designed 100BaseT and 100BaseFX equipment in the mid-90's and there is a very good reason Ethernet signals look analog on the wire ... We use the inductors and capacitors matching the drivers and receivers to the cable to round them off. Nice, perfect digital signals (square waves) are built from all odd harmonics of the original signal. It would be impossible to meet FCC emissions form the cables if you didn't eliminate these harmonics. The good news is that the receivers are really good at turning the differential signals in an Ethernet cable back into beautiful square waves on the circuit board. The Ethernet receiver also uses a PLL to lock on to the main frequency of the driver, so it even adapts as the driver frequency drifts. I can think of a couple reasons that one Ethernet cable might sound different than another but all of theses reasons involve increased error rates which would normally be caused by a bad cable, flakey driver or an overly sensitive receiver. Since the more complex and compressed the audio is, the more likely you'd break the decoding instead of hearing audio degradation. TLDR ... You might hear differences when sending audio over different types of cables but if you do'it's not because the Ethernet signals are analog.