Your plate amp should have speaker outputs besides the line out RCA jacks. I'm not sure on your subs, they used to use rca jacks as speaker inputs so if that is the case, you would run from the amp speaker outputs, a pr of wires(pos and neg to the red and black jacks o the subs(r+,blk-neg) to one sub and another pr to the other sub. I'm not sure if i'm understanding this correctly but the speaker output wires could be on the back of the plate amp because it is made to mount to a sub cabinet. Hope this helps. Maybe someone else can explain it better. Is the plate amp a stereo amp?
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