You will need to splice the first four lines in the chart above. The tip of the rca is the positive and the shield is the negative. Depending on the amp you buy, you will need to purchase twisted RCA cable (such as the mvp4 or and audison amp) or coaxial rca cable. It matters so you don't end up with engine noise or ground loop issues. The cost is about the same. Check your manual to see which kind is needed, or check with your supplier.
As far as a converter, as long as you tap between the head head unit and the amp, you are getting a low level rca level. It's actually below the standard voltage level for rca, but most amps have enough sensitivity adjustment to make up for the difference. You may need to get a line driver to add additional gain, or if you run into a problem like Jimmy where there is distortion due to the differences.
I can recommend a couple products that can help. The best option is a dsp unit that costs bucks, but would give you most of what you are missing not having the Audison total eq compensation and time alignment. For another day..
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