I just noticed that lately music that I have imported from CDs have low sound quality. For instance, I look at music that I have (from iTMS) and it's volume is at -10.2 dB. But the same song after it being burned to a CD is at -7. I can just adjust it, but I don't know why itunes is doing this. I don't feel like I've messed with the setting or anything. But I have noticed that my CD sound is very low, is there any way I can prevent this from happening?