Whichever one you connect to the positive terminal.
The colors are there so you can find the same wire at the other end.
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Yes; it is tinned copper.
It doesn't really matter, as long as you connect them to the same polarity at both ends. Most people use the gold or reddish-copper wire as the positive, as it is the red terminal and the silver, or non-colored lead to the negative as it is black.
The new speakers come with un-stripped copper wires..... you need a pair of wire strippers.... i put in kenwood speakers and the size of the wire was 14 somethin. you would need to get a wire diagram for you car/truck to see the colors of the positive and negative wires. then look on the aftermarket speaker box to see which wire is negative and which one is positive.... After you would do all this, just match up negative to negative and positive to positive. simple as that. I'd recommend wire nutting the wires or electrical taping them... but DO NOT put all four wires together. that will mess your speakers' sound up completely. wire nut the positives together and then wire nut the negatives together.
No. Ni-Chrome wire is resistance wire used in pottery and as a heating element for pyrotechnics. There is no application for Home Theater for this wire.
It actually does not matter as long as you are consistent. Most people choose to use the white stripe as positive, but it is definately not a rule.