My house came with 2 wall speakers. There is wiring for both of them. The right and left speakers have 2 wires each.
I'm trying to hook them up to my amp but I have no idea which wire is positive or negative.
- They are both copper
- Neither wire has a stripe
- The insulation for both wires is the same color (gray)
- There is no + or - indicator on the insulation
I'm at a loss. I also tried hooking up one speaker and then swapping the wires to see if the sound quality was noticeably different one way or the other. I honestly can't tell, it sounds good either way.
Sorry it's blurry but as you can see the wiring is identical. The insulation as Ecnerwal mentions in his answer is different - one is smooth and one ridged.