Only have one wire out of PC and trying to hook up traditional two wires to amp then to speakers

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Jan 23, 2019
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I have a one year old fancy Dell that has one wire out to what I believe is a powered sub woofer. From there two single wires go to the speakers. I have purchased a small amp which has rca jacks in and then bare speaker wire out.
Problem is how do i connect the amp from this one wire deal?
 
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