Thanks. I guess tapping into the rear door speaker wires and installing the LOC would work too? They are powered by the HU, not an outboard amp. I'm thinking tapping into the factory amp outputs and installing the LOC there would be easier though since I could use 3' RCA cables(I have some) instead of running a longer set from around the HU back. The subwoofer amp is attached to the subwoofer enclosure. Thoughts?