Could you please listen here and see: http://www.youtube.com/watch?feature=player_detailpage&v=tASSU5_2jvc#t=229s Does this music make any rattling sounds in your headphones?
 
On mine, when the heavy sound comes in right around 3:50 my right ear-cup starts to rattle. I would really like to pin-point if this is a problem with just my headphones, and if I should send them in. 
 
I have been hearing this rattling recently, although less than what I noticed when listening to this song. When I came back to other songs that I heard it before I couldn't hear it, so I figured it may have been a psychological thing.....but this is too obvious to be a fake. 
 
On another note, what would cause a monitor to make any sort of rattle sound? 

I'd like to help you out - which way did you come in?
 
Seriously though, the sound in all likelihood would depend on how loud the volume they're being played at.
 
It could also be a hair in the voice-coil.

I'm not exactly sure what you mean... I listen to them at what I believe to be a fairly reasonable volume; around 50-60%
 
However when I turn the volume down to 25% or lower, I can still faintly hear the rattle. I guess the next thing to do is send it to Audio Technica and have them try to fix it...
 
Thanks for your help!  

M50S LE here. No rattle. I even went as far as to use my Fiio E11 to jack the volume even higher than 100% on my MBP and still no rattle. Sounds like something was shaken loose in your cans.

I just listened to the track with my M50's i dont hear any rattling from my phones.

I hear distorting just little on both cups on my D7000, ironically. That file is very low quality anyway.

There is some distortion (static noise?), yes. I heard that in the M50, too. But I couldn't hear anything rattle. Isn't rattling different from static?

Quote:

bill-p said:

There is some distortion (static noise?), yes. I heard that in the M50, too. But I couldn't hear anything rattle. Isn't rattling different from static?

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Yeah, i picked up on the static noise, but i am sure its embedded in the audio file. I definitely don't hear rattling.