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In most speakers typically, the white wires or wires that have a white marking are the wire that is positive. The completely black or unmarked wire is typically that wire which is negative.
A smaller gauge (larger size) wire can safely conduct more electricity than a larger gauge (smaller size) wire. Decreasing the AWG size of a wire by three will double the cross-sectional area of a wire and double the amount of current it can carry. Changing the AWG size by 10 will change the cross-section tenfold.