Earphone problem

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I'm using earphones for the first time on p6200. I've tried with Samsung galaxy S factory model while watching movies but I have a problem. The tone is funny, I'm hearing some tones ok, like gunshot and car engine but people talking is bad or no tone at all. I think that it has something to do with 5.1 sound because sound of camera mp4 clips is ok. On tab speakers sound is ok. Is there some settings to fix this and is this problem only with this model earphones? Maybe if I change them...
Thanks.

Came home and tried original sgt+ and some PC Skype earphones. Works without mistake, sgs don't. Problem solved.