So I think I've narrowed things down to Oyaide and looking at their speaker cables, likely bulk because I'll either go bare or tin the ends. They have two versions I'm looking at, both have two poles. One is stupidly thick but does have a shield with a drain conductor while the other is (still thick at 12 awg) but doesn't have one. My router isn't too far away from my whole setup, like a foot outside the far speaker. So my question is: will the shield in a speaker cable matter here and if so, what do I do with the drain? EDIT: I've researched a bit and someone (elsewhere) suggested to put the drain on the negative amp speaker output terminal with the black/negative conductor if the amp doesn't have a ground terminal screw (mine doesn't), while floating the speaker-end drain. I don't think floating both sides would be helpful here, but also I dontd know if fussing over this shield for a speaker cable is even a useful endeavor. The router close by does impact my tube power amp if it's too close, I've tried and brings in weird noises. So to answer my own question I found this from someone claiming to be an EE and makes sense. Short story, speaker cable is self sufficient from noise and no shielding is needed.