Hello Jax GS300,
Yes, you can use RCA cables. Just wire in a "low-level" converter.
Using RCA's is really the best way, allowing you to run shielded wiring to the sub, making it less likely that the wiring will pick up electrical interference. I'd install the converter on the rear speaker wires behind the dash.
If you do not want to convert the speaker output, you can drive the Kenwood directly from the speaker wires. The diagram in the install manual shows the connections coming off the rear speakers.
Here's a link to one output converter. This one will convert all 4 speakers.
http://www.crutchfield.com/p_142SLC4/Scosche-SLC4.html?search=level+converter
Hope this helps.
NEED THE WIRING DIAGRAM
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