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lol...What were you using. Speakers are probly the only item in the car you can get away with using almost anything. They only have like 2 volts and super low current.
I used house hold type slip wiring. One clear and one clear/stripped. It was the cheap crap that you used to see around 20 years ago, most likely you weren't around at that time so you have no understanding of what I was referring to.
Doesn't matter, household speaker wire is not compliant with moisture, movement, or anything automotive electronic. See you might not think there isn't a difference, but you don't understand what your talking about.