i have a 2004 gmc duramax, its got 140.xxx on it and ive had it for alil over 2 yrs. when i 1st got the truck the stero sounded great.. but within the last few months ive noticed there wasnt as much bass as there used to be...then i was listening to a cd that had some bass in it the other day and noticed that it was only coming out of the speakers and not the sub, had my brother feel down by the gap on the passenger side and couldnt feel any air blowin...could this be a fuse or could the sub be blown? would greatly appreciate all info

and also my radio has cut out a few times randomly, its happend bout 3 times and the first couple of times it came on when i wasnt paying attention and the last time it happend i jus turned my truck off and back on and it worked.....

thanx ben