ALL iMacs have a fan. ALL late 2012 iMacs have a fan that runs at 1200rpm AT LEAST at all times. ALL such iMac fans produce airflow. ALL such airflow is audible as a gentle, quiet air rush sound.
I - like MANY others, I might add - can hear this air rush very clearly in normal use. I am sorry if you have impaired hearing.
You're being quite rude. Let's analyse your statements, shall we?
"All iMacs have a fan": Yes
"ALL late 2012 iMacs have a fan that runs at 1200rpm AT LEAST at all times": Yes
"ALL such iMac fans produce airflow": Yes
"ALL such airflow is audible as a gentle, quiet air rush sound": Yes (depending on various factors)
"I - like MANY others, I might add - can hear this air rush very clearly in normal use. I am sorry if you have impaired hearing": No
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Now let's analyse the words, "...can hear this air rush very clearly in normal use."
Define "clearly?" When you glue your head to the back of the iMac? In an office environment? Where exactly are you locating your iMac that you can hear it easily? What are you comparing it to? I've owned quite a few iMacs, and I know for a fact that my 2012 iMac is quieter than my previous 2009 iMac (I had them both side by side, and compared). I do NOT have impaired hearing. My hearing, as stated previously, is excellent. I cannot hear my iMac at all unless it's the dead of night, with all the windows closed, and absolute, ABSOLUTE silence in the room. At that point, it's only slightly more noisy than inaudible.
Like I said, if you hear your iMac to the point that it distracts you, you have a broken iMac.
But clearly you're not to be convinced, so let's leave it, shall we? You'll just be responding to other people from now on, because this conversation is over. Have a great day, sir.