What are the "rear line out" and "front line out" RCA wires for in the back of

LD50

New member
my boat stereo? There are only 2 "regular" speaker wires coming out of the back, but on the front of the stereo it says 4x45 so I am assuming it's four channel. Are these RCA jacks for speakers or do they need to go to an amp or something?
 
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