can tell u not from the industry...
No I'm not, but I'm immersed enough to nitpick on such nitty gritties.. ;p + - designation is technically for hot and cold signal for balanced connections. A headphone connection (L, R, Gnd) is unbalanced and even though the plug is the same, one should not use + - designation because the designation of the physical connections are T R and S. Simple reason being you could terminate the same connector with a phase invert, one side would be + - Gnd, the other would be - + Gnd.
So I was just trying to say + - are designation for the electrical signal, T R and S are the designation of the physical connection. But like I mentioned before, I'm just nitpicking because it makes a difference from an electrical engineering point of view. ;p
T - blue (left)
R - red (right)
S - copper (gnd)
is not the same as
T - hot (+)
R - cold (-)
S - Gnd
