The sound system on my 2011 Elantra is excellent except for one thing: when I play CD's, especially classical albums, I have to turn up the volume to "MAX"(volume goes from 0 to 35, which is the maximum). With the XM radio I generally don't have to turn it up past 20, but when I put a CD in I have to turn it way up. Even when I adjust the settings in "audio" to max, the output is much lower than it is in the other modes (including when I play my itunes through the iphone input). Has anyone else had this problem?