Speaker help

I bought a 2015 6 GT a month ago and I love it. I have issues with the speakers though. My driver door speaker rattles when base hits, my passenger speaker gives no base. Is the base supposed to only come from the passenger door speaker? Or is it supposed to come from both front door speakers? Also if I should replace my speakers, what is the difference between these two speakers? Why such a dramatic price difference? They both say OEM front door speaker. Thanks!