I just received my rMBP. 2.3/16GB/256MB/mountain lion, updated. The speakers are letting out an occasional pop when any audio is played. I tried web video, audio in itunes, audio in quicktime, video in quicktime, and audio in VLC. multiple different tracks and videos. all the same - occasional speaker pop. i'm not sure if it's a specific audio frequency that's causing it, or if it's a speaker problem, or if it's a bit of lag, or what. has anyone else experienced this? EDIT: oddly enough, as i was typing this post, I noticed that there was some lag behind my typing and what was being displayed on the screen. I restarted, and now typing is responsive and the speaker pop appears to be gone. could this be failing hardware?