Best way to wire this sub? (pics)

[Jc Lee]

I have a boat with a marine radio blackbox (sonic hub 2). In the manual it shows how to connect a subwoofer (bottom pic). the 2nd pictures shows the JL marine 4 channel amp i'm getting and planning to hook up. The system will be two 6.5 speakers and one sub. Theres a left and right RCA jack for subwoofer. Why do i need 2 channels for one sub? And also, i won't even be taking advantage of these 2 channels unless i bridge the channels at the amp which i'm not planning to do. Any recommendations or thoughts?

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[campgood]

Say you listening to headphones,you know how in some songs that have a bass sweep that goes to your left ear to the right ear? That's why there's a left and right. The amp takes both of those channels and makes it one.