There is a new Sony PS4 Pro, much quieter than the original. For the moment, it is only available in a Red Dead Redemption package, but it will eventually be available as a standalone product as well.
The new version of CUH-7200 would have made the sound of the console 50 decibels to 44 decibels although, as noted EuroGamer it can still exceed 48 decibels. The noise reduction would be due to improved cooling, which would reduce the stress on the cooling system of the PS4 Pro. The original Playstation Pro was released two years ago and can sometimes roar like a jet engine.
With the revised model looking the same as the original, check the model number on the box to verify that you have chosen the quietest option.