Coming from over a decade in recording studios and working on home studio projects, yes, it totally lacks low end. This is fact, not conjecture. If it sounds ok to you, fine, but it is simply a fact that the stock stereo is only giving you a narrow frequency range and that you arent hearing all of the music, mainly because the stock system has no sub. How would you like to go to see a movie with a theatre that lacks subs? How do you think the movie would sound then? Thats right, terrible and weak.
Those stock 5" door speakers or whatever they are can not accurately reproduce frequencies below a certain threshhold so, likeit or not, youre not hearing all of the
music. Being a bass player, music missing low end blows. Not to mention the stock system just kinf of blows: underpowered, tiny magnets, i could go on.
It sounds ok to you until you add a sub and then you go, oh, thats what the song
sounds like. I new it was crap the second i got the car. Zero impact with the stock stereo. The sub addition makes it livable. With no sub you are missing hearing anything from 25hz give or take to about 80hz, a huge chunk, and you arent physically feeling the music at all. Anything in the 18hz to 30 or so range is the feeling part that you are lacking, in layman's terms anyway