Earphones stopped working properly in Galaxy S2 after putting new ones in

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http://forums.androidcentral.com – Up until last week, I was using my original samsung earphones and some Philips earphones in my phone to listen to music without a problem in nearly 18 months. Then I bought some Adidas Sennheiser earphones and plugged them in and now I can't hear the vocals and the music sounds tinny. I then put my samsung ones back in and same problem, even though they were working perfectly fine up until last week. Now any headphones I put in are not working properly but they work in other peoples phones and in my pc. HELP!!! I don't want to have to get a new phone. There must be a reason why they wo (HowTos)