Ethernet cables


So I've been streaming for just over a year (I'm really an analog guy, listen about 75% to my TT set-up). Been listening to Roon/QoBuz via my MacBook Pro thru a Bricasti. The Bricasti is hooked-up via a Ethernet cable to an Xfinity "POD"  which works well. Yesterday got in a Roon Nucleus and what a great sonic improvement! Very happy. But here's the question. I'm using a very good Ethernet cable from the Bricasti to POD but how important is the Ethernet cable from the Nucleus to the switch? Personally I haven't done much comparisons with Ethernet cables. 
(Dealer disclaimer) 
sksos
A lot of people here are impressed with the optical Rendu that reportedly removes noise and significantly improves sound quality, so that may be something to consider.  Best of luck. 
Check Network Acoustic. I have the Eno system and the result are phenomenal.....everything more natural.....top
Hi sksos: I found this review article helpful  http://www.audiodrom.net/en/special-edition-reviews/104-ethernet-rj-45-cables-shootout  In the conclusion section they determined that the cable from the modem to router wasn't important. I had a combination of Supra Cat8 and SOTM Cat7 in my system. I recently replaced the Supras with the Viablue cables. https://tritonaudiocables.com/Digital-Cables_c_23.html  They are a bit more money, but they are a definite upgrade in sound quality from the Supras (better frequency extension and the highs really sparkle without edginess). The SOTMs are for sure the best, but at a price. Good listening. Jeff
Hi yoby, I have the same via blue cable from my router to the SotM switch se with master clock inside. But from the switch I can only strongly recommend the ENO system from network Acoustic !!!!!
I also saw a big difference when you put a linear power supply to your router/modem.