Just switched from a unibody Macbook and I'm finding the Air's speakers aren't so loud, huh? Right now I'm running this NPR stream on full blast and it's at merely a comfortable listening volume. Same for you?
http://www.npr.org/player/v2/mediaPlayer.html?action=3&t=live1&islist=false
http://www.npr.org/player/v2/mediaPlayer.html?action=3&t=live1&islist=false