i have just put in a kenwood cd deck with some 6*9 into a hyandai excel but there seems to be a problem with the bass. The thing is there is no bass. The speaker hardly viabrates. I know it is not the speakers because i have tried them in a different car(and they were perfect) and i do have the poles connected up right. So my question is does the sound very from car to car? Or do different cd dects play different sounds?