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What an idiot I was.  I made a few phone calls and inquired about a few high end ceiling fans. The smallest 6” BigAssFan cost about $3K, I need two – so it is kind of too expensive. Some other best fans are around $1K each.  They all promise around 45dB noise, forgetting to say from which distance. At listening position my two ceiling fans fan at full speed do 58dB. The air noise does not bother me, the fans are large and the noise is relatively low frequency. What bothers me is the buzzing and the presence of the sound of closed “A” vowel. It feels like it is sound of motor or bearing…. Then I begin to read on the subject, here is for instance:

http://www.ceiling-fans-n-more.com/ceiling-fan-controls.php

Well, I have two SS dimmers that drive the fans. It has to be the problem. I took them off and put the regular switches. Hallelujah! The “A” hamming instantly gone and the fans begin to spin faster! Now they produce much more air flow then before and at listening position they do 49dB. The noise is not much lower but it has no annoying harmonics and I do not even need to lower the fan speed. Apparently the SS dimmers even at full bypass did screw the wave.  Well, the idiocy is not fully belong to me as the fans and the dimmers come with the house- and the guy who use to live here was master-electrician. Anyhow, the problem is gone.

BTW, ghpicard, the use of dimmers does not radiate electrical noise in my case. I mean it does and a single dimmer in house does fuckup up Sound very dramatically. It can be even measure not only heard. However I have dozens of dimmer in house and I use them very adhesively with zero impact to Sound.  The answer is PP2000. You can say whatever about the PP2000 but among many things that it goes absolutely perfectly is eradicatation of any sonic impact from dimmers. I did many experiments trying to detect if Sound would be affected by many of my dimmers. I was not able to detect it.

Rerurn to Romy the Cat's Site