I think once you get it apart it'll be more clear, your drawing is way off. Most amps have high level and low level (rca) inputs, you'll simply use the high level inputs. The wires that go to your speakers now will go to the input of the amp, the output of the amp will then be wired to the speakers. Once you decide what you are going to get, there are plenty of write ups, and plenty forum members ready to help.
Sent from my SPH-L710
2010 FLTRX With Plenty of extras, goes by the name "Hardeshia"
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Also not pictured 2016 FLTRXS and 2017 FLTRXS, you never can have too many SHARKS......