i am running my system off stock head unit (replacing it is out of the question or i will lose functionality of my stock cd changer) and i am running my sub amp off a loc. i am now upgrading my front stage and adding a 2 channel amp so should i use rca splitters to split the signal going to the sub amp to both the sub and speaker amp, should i use the line out on the sub amp and daisy chain to the speaker amp, or should i add a second loc and run a second set of rca's from there???