Would I need a sound card to add a subwoofer?

Here's my problem, my cousin plans to look for a 2.1 sound system during Black Friday, but his mobo only has line in, stereo, and a headphone jack and I'm wondering is there any way to add a woofer to that system as is. Here's his system, if I need a soundcard I'd like a PCI-E x1 model.
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  1. Best answer
    you don't need a sound card, unless you want one

    you simply run an audio line out (the green port) to the sub. the sub then runs a line to each speaker. All the wires will come with a new 2.1 system.
  2. Best answer selected by mister g.
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