I have a 2012 optima sx turbo with the stock infinity system without navigation and I got two p3 15's with a 3000w pl3000.1d amp and a lc2i loc. My question is why does it seem to only hit when I have it on high input and not low input? (Ps. I have the loc running off the factory sub in the back and my subs are wired to 1ohm)