Both owners of new Minis and iMac owners have reported speaker popping coming from their Macs when connected to external speakers via the headphone jack on the Mac. Personally I have had both an '09 Mac Mini as well as an early '09 iMac and both have the speaker popping. It is pretty easy to reproduce too. When waking up from sleep, opening iTunes, etc, there is a loud distinct 'pop' from the speakers. I now know that it's not the speakers either, as I just replaced my five year old Logitech 5.1 setup with a new pair of AudioEngine A2 speakers, widely regarded as among the very best computer speakers currently on the market. Both speaker systems exhibit the same popping noise intermittently from the Mac. Apple, you have a reputation for high end products, I would say that loud popping noises coming from your Macs, which could potentially hurt someones ears or damage their expensive speakers or headphone is simply unacceptable. Please fix this!