Network switches

[AceRimmer (Smoke me a kipper, I'll be back for breakfast!)]

This tells you most of everything you should ever need to know on the subject quite possibly.
Just one of many here…

Do router and ethernet cables affect sound quality?

Jan, power cables are soooooooo 2010. All the cool kids have moved on to hire live yoga into our listening rooms - really sorts out those pesky bass dips. . I hear Amir at ASR is hoping some kind (or maybe that should be blind) follower will send him one for detailed measurement.