Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Reid and Heath Acoustics MA-350 Earphones Review
Reid and Heath Acoustics are a UK based company and are the company behind the MA-350 Aerophonic earphones. This set of earphones will set you back around ?30. Included in the box you get a carry case , 3 different size tips and also the earphones them selfs. The earphones have a 10mm driver which give of an amazing sound and if you like your music loud then these seem to be the headphones for you. The sound does become a little muffled on 100% volume on the iPhone. We found two problems with the earphones the first being the L & R markings these seem very hard to find at first , The other problem is the lack of a microphone and also volume controls on the cable. One thing we loved about the earphones is the design , made out of aluminium the earphones feel very sturdy and feel pretty tough. The cable on the other hand does feel a little on the flimsy side but is a lot better then most earphones in this price range. We would recommend these headphone to anyone who likes there music loud and also people who do not use the microphone and volume buttons on earphones. Thanks to RHA for sending these out for review. You can buy them here.