Audio saturation - new MBA speakers

[senkeiser]

Hi everyone, I'm having a problem with the speakers of my (2) macbook's air 13" 2012.

When I put the volume to max , in Skype, or even on Youtube videos, the sound just 'saturate' and sounds like 'grchhhhh...' It crackles .

I thought this was a problem with my macbook air, so just went to BestBuy and replaced my MBA by a new one. But *sigh*, same problem with the speakers. They can't play music on high volume without saturation.
The right speaker...
Is this normal ?

PS: For everyone who has MBA 2012, tell me if the sound saturate with this video (at max volume)
especially when the guy is talking...
http://www.koreus.com/video/movember-david-moustache.html

Thanks!

 

[senkeiser]

I founded by myself that this seems to be caused by a keyboard vibration. (Enter key)

I'm disappointed for a 1300$ laptop made by Apple.