so i heard my trunk rattling today and decided my subs were maybe a bit too high, (pair of 12W3V2's powered by a JL 500/1) so i opened the trunk and turned the input sensitivity knob, only for the subs to pretty much completely shut off and have almost no thump coming out of them at all. i tried turning the input sensitivity knob back up (even quite a ways) and still hardly anything comes out, theres a little something towards the max but thats it, nothing like it used to be. does anyone know what has happed? I know next to nothing about car audio except ive invested a lot of $$...