hi guys i have a 12" audiobahn aw1200n powerd by an MTX Thunder 4001 class d amp,,, well when i was drying the car i opend up all the doors including the trunk, and had my stereo on,, when i opend the trunk it kinda smelt burnt, so i sniff around the opening of the port of the box and it smelt burnt,, i was wondering if this is normal??? the gain and bass boost on the amp are both half way up, and only putting out 400 watts rms to the sub,,,