to the article authors:

please explain what do you mean under:

"As mentioned, the noise character is very low and smooth. This is ideal, since the lower frequencies do not cover distance easily."

afaik, the longer the wave, the larger are the obstacles that the wave can bypass unimpeded.

regarding the top fan placement: in case the "extra metal" is the primary suspect for causing the increase in noise level, has anybody actually went and cut that metal out just to verify the supposition? i mean, i am choosing a case now, and it would take me like 10 minutes to cut that metal out nea...