General :: Earphones Stopped Working Properly In Galaxy S2 After Putting New Ones In

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. I don't want to have to get a new phone. There must be a reason why they worked one day then as soon as put in the Adidas ones something changed. I have checked all the settings on the phone, have looked at heaps of blogs on the net and here, tried the WD40 on a cotton tip, tried cleaning out the headphone jack, tried pushing the headphones in all the way, tried turning off, taking out battery, turning off and on while headphones were in.