which color of the speaker wire is positive
In dealing with speaker wires, the positive speaker wire will be silver in color. This is only visible if the insulation is clear or see-through so that color can be distinguished. The negative wire will usually be copper in color for this same instance.
Look at the Wire Itself. Every speaker wire will have an indicator to tell them apart, such as color. In some high-end speaker wires, the insulation is clear, or see-through, enough to see the bare wires. When this is the case, usually the silver wire will be the positive polarity and the copper wire will be negative.