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There isn't an easy way. To do it, you'd need to take a set of RCA cables and plug them into the sub output from your deck. Then you would need to cut off the terminals from the RCA cable on the other side, and solder them to the sub input wires on your wiring harness. That should work. But like trukn1 said, most people go aftermarket. Thats what i ended up doing.
you'll get a lot more performance...to tel you the truth I haven't been very impressed by the nakamichi...but then again my sound system's a teenager now.