How to clean beats by Dr. are headphones?

Is it normal that Beats by dr dre Studio HD's sound can be heard outside the headphones clearly?

• I bought Beats by dr dre Studio HD and I made sure they're real not fake. They're sound is really awesome and I really love them, but the problem is that when i put the sound volume on the max 100% it can be heard really clearly by the people who are sitting next to me but when i reduce the volume to 70% it still can be heard but hardly and when i reduce it to 50% it cant be heard. Though i dont want to reduce the sound volume and i want to enjoy the music when i'm on a trip with the school for example. So is it normal that Beats by dr dre Studio HD's sound can be heard outside the headphones clearly? Or is there something wrong in my beats and i should fix it? Thank you :)

• Answer:

  this is normal...