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I'm going to be feeding my sub around 400w RMS. Will a 16 awg wire from KnuKonceptz cut it or should I spend like $2 on a new 12 AWG wire?

Just checking to make sure I dont blow anything up.

it's high voltage AC for amp to speakers. 16AWG is plenty fine.

you only need to worry about heat on power lines, where you have high current DC voltage.