two speakers adding

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    Adding 2 speakers to my original 2 speaker setup?

    Hi guys, Basically i have an old car with only two front speakers and no rear speakers in. Ive update the head unit so it now has 4x50w outputs. Two outputs are linked to the front two speakers. How do i wire 2 more speakers from the amp? I want to use the 2 free outputs available but I'm not...