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?
