New 27" owner here. I find the internal speakers fine for music, maybe slightly too strong in the high end but .. What REALLY bugs me is trying to watch movies/TV on it. Any male voice makes an annoying humm/resonance inside the case. I played around with ToneGen and I can replicate the problem around 138Hz (C#3). Can anybody else try that to prove whether I'm crazy or if it's real? My wife and I used my 2008 iMac for TV episodes and that was great with the internal speakers, would like to do the same with the new one. Overall I love the new iMac and I will not be returning it, and I am considering buying external speakers, I just want to try every avenue before spending the time and $$ to do that.