Originally Posted by blazin_xb2

Yea traditionally a 4-channel amp is not used to power a subwoofer. It is possible that the bass boost is up too high, but since it was factory installed i would assume it was tuned for the vehicle and speakers, but i wouldn't be suprised if that wasn't the case. It sounds more like the rears have blown and the front tweeters may also have been blown or the high/low pass crossover isn't set correctly. You should probably replace both front and back sets with something that can handle a little more power, or just turn it down. You will want to find out the specs of the amp so you can match a set of speakers to it.

Im gonna go out on a limb and say you don't have an xB, considering the JL upgrade you probably have a tundra or something. If it's still pretty new, I would hit up the dealer and see what they say about it.

Originally Posted by Gymo

I have a tC, thanks for the info, def wen i get the mula lol