Utter silence is obtainable.
As mentioned previously, audiophiles demand it.
Recording studio's need it.
So, change your case.
You need it thick, and lined internally with noise absorbing foam.
You need it completely sealed, excpect for "S" bend ducts both into and out of the case, which are also foam lined.
Then have low speed fans on the interior of the S bends.
Water cooling for hot things an advantage here, to ensure no sound escapes the S's. The noiser it is inside, the easier for that noise to get outside.
So, big, heavy MDF box with lots of thick, ugly foam will do the trick.
No windows.
No accessible media devices.
But quiet.
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Long Haired Git
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