I have a 2014 Corolla LE with only 21k. Recently I noticed one of the speakers (RF) sounding horrible when a deep bass is on. I went to the dealership and they told me that the mp3 player amplifies the bass along with the radio to create that distortion. But if i put a CD with a strong bass in the mix it will still make that horrible sound. I was thinking about changing the front speakers but I know absolutely nothing about car stereo systems and am worried I will just throw money away if I change the speakers but not the radio, which I really like. Any suggestions out there about what I can do?