Let me help you get further down your road. RF energy is everywhere and you can't avoid it. You don't help the problem if you have a wireless network, a microwave oven or digital devices in your home. RFI can wreak havoc with your music, but only if the manufacturer of the equipment didn't properly shield and ground the RF sensitive components. Can you believe that some crazies (like me) attach antennas to bring more RF into their gear just to listen to radio stations? Even if you are in a lead lined room, the digital components of your audio gear are generating RF that can be harmful to unit they are in and others near it. The question again is how well it's manufactured.

When you are talking about Cat 5e or 6 ethernet cable, there are differences in the quality of cable. However, they are all designed to be able to carry a 1Gbs data signal for 100 meters with no loss. There are some that are specially designed to be used in environments that have extreme RF noise levels. This typically isn't your normal home or even a computer data center. Can they bring more RFI in to your equipment? Yes. Is it something to worry about? Considering the amount of self generated RFI in digital equipment, this is a pittance and not worth worrying about.

Now to help you down your road. Tubes! Dump all that digital stuff and go pure analog. No RF to worry about. You can move to a different obsession with tube swapping to reach that audio nirvana. If you are too heavily invested in digital, then your only choice is to swap out the copper connections for fiber optics. Hope this helped.

QNAP, MS600, MS200, Anthem AVM 50v, B&W 804S, JL Fathom 113 (2)