the question of changing ethernet cables

@finnlove Believe you're speaking of Small Green Computer, specialize in optical steaming. I do use Sonore OpticalModule and OpticalRendu, many experiments with optical in past and continuing into future, some in next few weeks. With optical you can go with generic or Sonore FMC in which case you could go full optical from ISP through streamer, this may or may not beat any ethernet solution, hard to say, implementation is key.

Now, if you had optical capable router and all Sonore optical, fully optimized this could be very nice setup, full galvanic isolation from wifi or any other noise. You would still have issue of wifi directly injected into router motherboard which cannot be elimated by any means other than turning off wifi on router. I bet you'd have pretty nice setup going this direction, I'd at least try if I had optical via ISP.

Keep in mind optical not so easy as install and forget, subject to optimizations and improvements just as any ethernet setup. I won't go into it here, but suffice to say Sonore equipment superior to the generic FMC. My further upgrades, already in house will come in due course.

Shoot! Yes, I did mean Small Green Computer. Good sounding solution and agreeable price. However, 81 Euro shipping cost is unrealistic. In the event of ethernet upgrades, I will have to look locally. I can see this needs to done by the logical explanations here. Yes, we do have a series of small lights in the ceiling. This could produce some infect as mentioned.

Another good point (Lalitk) check the gas before changing the spark plugs. I do have a new amp from PS Audio - BHK Signature 250 Amplifier - it is a hybrid with tubes. I will check with similar threads to see the FB. I just put a Shunyata Alpha NR on it. Most of the interconnects, where critical, are Cardas. I have MIT 16 speaker cables to the Focal Sopra 3 speakers. I have the PS Audio DAC/streamer and PS Audio SACD. Preamp is the primare S P32 that has no tubes. Planned is to replace with a Trinnov Altitude 16 for Home theatre. To this end I have a 7-channel Primare amp but it is not on for music. Likewise for movies only is a Primare A32 for special effects or rear surround, Atmos. Surround speakers are the Klipsch 500 series and Atmos Klipsch 400 series. Speaker cables are very heavy gauge wiring due to the distance. Again, only used with movies. Same with the B&W 855 subwoofer with upgrade. In all of this, NO, the ethernet cable is common and not shielded. Other mains cables are stock - planned is supra shielded cables. All of my cables are isolated and run through cable channels for separation and no crossover possibilities. Same as in the wall with the new wiring, they are each run through their own channel. I do not have a power conditioner yet. I am looking PS Audio 15 for the future.

The router is from the phone company and was first produced by huawei It most likely stock. I am looking into this as well. I found a dealer in the Netherlands. I'll let you know what they say.

@sns I like the idea of your upgrade going optical. As I seem to be developing a real tick for this stuff, I will look into that for the future.

Okay. Many thanks. My ignorance is slowly graduating to just a simple lack of knowledge. As I mentioned, I had a dedicated installed. That meant the ethernet had to go to another outlet because the new cables were too thick for everything to fit. To help me, the electrician left a long 5m cable so I would be flexible to finish the set up. From you guys, I just learned that I have 5m long attenae picking up every noise it can along the way. First step solved. When I get the parts needed, I will report my findings. Thank you everyone. Ignorance is not always bliss.