Installing LOC from head unit to amplifier to sub?

Working on installing a line output converter into the back of my head unit, and then plugging in the RCA cables to run to an aftermarket amplifier.

I have four wires on the LOC that are supposed to be connected to left + and - and right + and -, but on the factory head unit there are REAR left and right + and - and FRONT left and right + and -.



So which should I splice into to run back into my amp, which will be powering a sub?

I'm assuming the rear ones, but I thought I should check first.Installing LOC from head unit to amplifier to sub?
either will work but i would use the rear speakers so the fader will work correctly.Installing LOC from head unit to amplifier to sub?
hmm

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