How do I connect an speaker rca cable to rca output on aftermarket harness

[loudxavier]

I have an aftermarket head unit that has 4 rca outputs I want to know how or if it's possible to connect a speaker wire to an input rca cable for sound that's not really low.

 

[alexoiu]

If "that has 4 rca outputs" then yes.
If "to an input rca cable" then no.