Bass Addict 10+ year member
Hell on wheels
i said bigger box is cause i seen what one would do in a bigger box,but obviously thats not the problem.problem has to be,speaker wiring,sub level needs to be turned up,check gains.after looking at that x manual,there should be two of those jumpers plugged in.thats what i would do first,take speaker out of the box and redo it to eliminate that problem