Support mp3 playback on wired devices loses vocals?

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http://androidforums.com – While using my Razr-Maxx as an MP3 player with headphone jack, ( ie: to car stereo or headphones) my music has excellent instrumental sound but the vocals are extremely quiet to the point of not hearing them at all. I have messed around with the different EQ settings and no luck. If I listen through a Bluetooth speaker, everything Including vocals is perfect. I am using the stock Google music player and all my mp3's are high bit rate. Phone is rooted with no custom ROMs. I tried an alternate music player with no resolve to this problem. MP3 play fine on other devices. Any suggestions (General)