Music voice sound very low and music background sounds fine.

Hi,

I have a sony mh750 headphones pair and at first it was working great. I have not used them for like 2 months and now when I plug them the music voice is like very low and distorted, but the music background sounds completely fine. Do you have any idea what is the problem? And yes, I tried them on other phones even on PC and it sounds the same?

Please help.

I didn't find the right solution from the Internet.

References:-
http://www.tomsguide.com/answers/id-3333...ounds-fine.html
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Thanks