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Generally, you have one of two situations:
1. Your headunit has dedicated subwoofer outputs, which are a pair of RCA jacks labeled "sub". If so, internal to your headunit you'll have options to set what the crossover frequency is (aka which frequencies go to the sub)
2. You headunit doesn't have a pair of RCA jacks labeled "sub". In this case, you generally will use the "passthrough" RCA jacls from the amplifier for your front/rear. You will connect an RCA cable from the passthrough jacks to the input jack of your subwoofer's amplifier. Then, on the amp you can set the crossover frequency of what will go to the sub.
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