Today my sr80s arrived and i noticed that when i turn the volume up/down i can hear a strange sound coming from the left pad... Have you ever experienced a similiar problem with these and other cans? I never experienced so i need you to tell me if i should send back the cans or what...

Hello all, this is my first post on head-fi.org so sorry if I lack of precision and sorry for my bad english (I'm an Italiano guy).   I'm going to have a total audio hardware upgrade and the first step to it is the choiche of the headphones. In these years i just owned a crappy pair of...