I bought a hatch 2012 w/Bose today and was reading how to change a flat and discovered a subwoofer on top of the spare tire. How does it work? Does it come on when I turn up the volume? Is there a kill switch for it? The handbook doesn't mention the subwoofer except in the tirechange section. There is no button on the dash that says "subwoofer". Are there subwoofer controls in the digital dash audio preferences section? Also, I'm wondering if I need to buy oversized baggy pants?