Skimmer noise is very subjective and something that is quiet to someone may not be the same for another person. Different skimmers emit different types of sounds and people react differently.
I have used curve 7 and I always got compliments on how silent the sump was and it was in the open (no cabinet). It skimmed great too. But like I said, just because I considered it to be silent doesn't mean you will have the same experience. Alongside, the water level and the dial position plays a big role in the noise too. If you want a number to compare, the sump was at around 65dB within 1 feet.
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You wouldn't want to see my tank. I don't use fancy equipment and I am a noob
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