http://www.sennheiser.com/sennheiser/icm_eng.nsf/resources/mx250_zoom.jpg/$File/mx250_zoom.jpg I got headphones like these. I don't know if it's the headphones but the doses are still not working! :( Like when im just chilling and relaxing on my chair and open a chair. I close my eyes and listen to...

Do they ALL sound like a vacuum?

Because all of em sounds the same. And all of em don't work

And I got like those headphones that you can get with your iPod or MP3. I dont have those big things. Does it matter?