hmmm... actually even a small attenuation of noise will be useful for me, like I wear those headphones in Lan PARty areas (gaming) lots of noise come from opposite teams, so a little bit noise dampening would help me, its not necessary that noise should be dampened totally / perfectly.

Thanks alot guys, does lightweight vinyl sheet would damp the ambient noise if I stick them on the inside of the grill??   actually even a small attenuation of noise will be useful for me, like I wear those headphones in Lan PARty areas (gaming) lots of noise come from opposite teams, so a...

Any sound damping foam ? or material, cuz i dont want to spend 200 dollars on pc 350 or 360 (not less than those models),   Any sound damping material that you can suggest? i will place it inside the grill at the cost of sound quality...

  I would like to know what is required to make Sennheisers HD 555 passive noise damping heaphones, so that I wont hear the ambient noise or sounds, as they are Open headphones, i want to make them closed.   Please this is urgent right now, any help will be appreciated. Thanks in advance.

I would like to know what is required to make HD 555 passive noise damping heaphones, so that I wont hear the ambient noise or sounds, as they are Open headphones, i want to make them closed.   Please this is urgent right now, any help will be appreciated. Thanks in advance.