Hey all, how would you rate the sound through your 2011 MacBook Pro's headphone jack? After swapping back to my 2009 Compaq/Windows laptop to use ArcGIS for a while (and to go through my old iTunes library while working), I noticed something odd.. my old Windows machine seemed to produce far greater sound quality through headphones than my MBP. After swapping back and forth between the two laptops, and listening to the same minute of Deadmau5's 'Strobe' on both machines multiple times, it became apparent that my MBP had muted, dull, flat sound when compared to my Windows laptop, which produces amazing sound through the headphone jack. No matter which song I tried, or which headphones I used, the results were the same. Using Windows on my MBP has always generated slightly different sound to OS X so I left it out of my comparisons (it was always nearly identical to the sound produced by OS X though, so it was never all that noticable). I swear this wasn't the case though when I first got my MBP (a recent exchange for another unit with a faulty graphics card), it sounded the same as my Compaq, but after applying the recent EFI update, it now sounds quite different (although as I hadn't been using either laptop much around that time, I probably wouldn't have noticed for a while if I hadn't used the Compaq). Could the EFI update have caused this, or has something happened to my MBP's headphone jack? Or do the 2011 MBPs generally have poor sound through the headphone jack and I missed out on that fact initially?