I have a new 2013 27" iMac. I have it hooked up to a set of Bose Companion 2 speakers and my headphones plugged into the speakers. I rarely ever use the Bose speakers. I use my headphones 99% of the time for my audio needs. I am seriously thinking about eliminating the speakers and plugging the headphones directly into the iMac. Then I would just use the built-in speaker on the iMac in the rare occasion I want external audio. It would eliminate clutter on my desk and free up another electrical plug. I guess I am looking to see how many of you actually use the built-in speaker on your iMac? I am pretty sure I'm probably in the minority on this one.