Newbie needs help connect BA sub to C3

Hi all. I'm a newbie so be easy, I know enough to be dangerous. I bought a Numark C3 mixer about 2 years ago. I have a pair of older JBL EON G1's. I just was given a Boston CPS 10wi sub with Line level output. How do I work my sub into the system. The mixer only has two speaker outputs which I use for the EONs. Any help would be appreciated. I'd also be willing to pay someone to help me over the phone. I tried connecting the sub via an RCA cable (single input) to an unused channel on the mixer but it did not work. Thank you in advance.
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