Line out converter to power an amp and 2 subs?

I have an 06 Chevy aveo with a sony explode head unit but it does not have rca inputs. I know basically nothing about wiring and electricity. Please help!Line out converter to power an amp and 2 subs?
4 channel-

http://www.crutchfield.com/p_142SLC4/Sco鈥?/a>



2 channel-

http://www.crutchfield.com/p_142LOC80/Sc鈥?/a>Line out converter to power an amp and 2 subs?
Is it an aftermarket head unit or factory? If it's factory, then yes you have to use a loc. You need to get signal from the two rear speakers.

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