Load low constant hum on my new imac

Hello all
There is a constant low hum that is quite load and very annoying ...
Is this normal? how noiseless the imac should be?
As a musician, I am very surprise at the amount of noise generated by my imac
This low hum is constant and can be heard from 5 meters away
Thank you for your patient

I don't think it is normal (mine is very quiet). I would suggest that you make an appointment at your nearest Genius Bar or call Apple if you're still under warranty.

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[click on image to enlarge]
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Load low constant hum on my new imac

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