You have two because the second is a replacement for the first, which has a busted speaker, correct?
If so....then send back the first one.
It feels like you are over-thinking this.
yeah its a 2 grand computer, im little stressed lolz
to make a long story short, i had a 2011 standard macboo pro, had many repairs, fnally could get it replaced. paid an extra 300 to upgrade to retina, and another to bump the ram and processor. so basically i spent 600 on it.
got the lg one. all good, but 3 hours after getting ti the speaker or something (fan?) were making crackling noises like this:
http://www.youtube.com/watch?v=rx7Nwp9SE74
though for some reason it has stoped and its been 4 days.
then i got the samsung one. i notice the screen is a bit different which i expected, and its suppose to be the best since ghosting and all that other bs isnt as associated with it, though i liked the lg a little better since it produced a NICE white.
and theres a small hairline scratch on the back black plastic hinge.
so..yeah im kinda stuck and i doubt apple will give me another for a third time since this doesnt fall under the general 14 return etx as this was a replacement
oh and i have to return one of them obviusly lolz