Can anyone tell me what the specs and wire colors are for the premium audio system in the 2015 mkc with nav, (no THX). I would like to know the sub amp output?, high or low inputs to the sub from the head unit?, single or dual voice coil on sub? and the color coding of the wiring. I am looking to replace the factory sub and sub amp to get a little extra punch from the low end. I previously owned a MKX with the THX system in it and the sound was superior to this system so would like to beef it up.