posten this on the other thread.
You don't need a line out converter if you have the audiophile system. That system already has low level outputs... Infact the low level outputs are already ran to your trunk. Modify the wire harness that your rear deck subs were plugged into...
The RCA will share a common ground... which is not going to do very well for sheilding. Also the DSP will limit your volume on the amp because the crossover is built into your HU
Heres how you would do your job...
yellow/red wire will be your remote wire to amp...
red wire is your hot wire which i don't recommend using for an aftermarket amp its just so small, run a new wire directly from your batter which is already in the trunk so it will be piece of cake. Make sure you keep that wire insolated so that it doesn't short on the stray grounded metal in your trunk.
white/red wire will be the core of the Left RCA, the sheild will be the black wire wrapped in what looks like tape, keep in mind that that will be shared with the right RCA.
grey/red wire will be the right core for your RCA, remember it will share the same sheild as your left wire.
Black wire (not the sheild) will obviously be the ground wire. again i recommend just running a new ground...