Another area of noise is the doors which are used to load up supplies on the ship.
I've been on two cruises, the first a Carnival ship in the caribean, 70,000 tons and more like a floating hotel. Being American there was food 24 hours a day (it was said average weight gain was 7lbs a week) entertainment and what have you but alcohol was extra and expensive, most people smuggled on their own.As said very large and stable ship but it didn't really feel like a ship and the only staff we encountered were entertainers, waiters, stewards and bar staff very rarely did we see someone involved in actually running a ship.
The second cruise was a ship half the size run by Thomsons (topaz?)in the med and was better in my opionon. Cheap no label booze and it actually felt like a ship , a little roll and the noises sounded like the sea, and it also felt more homely.