Projects? not sure I understand.
Eh? Speak up. I can't hear you. I'm deaf from years of sitting next to loud projectors.
Projectors sorry I misspelled it
I understood once I saw the photo of the 16mm projector.
They are all different. There is a German model, the Bauer U3, that is very noisy (while actually a decent projector). There are Dutch Philips projectors, OTOH, that are all the exact opposite. People not used to both probably think they are very loud when visiting the booth. A large rectifier makes a lot more noise, though.
The ones I have at my cinema are Italian Prevost machines license-built by Zeiss, and can be very silent if properly maintained. A single damaged sprocket or a badly threaded film strip can change that, however.
What's interesting is that a good projectionist familiar with his equipment will immediately hear if something is wrong, because while they all make some noise, the quality of that noise will change if something happens.
And yes, they are louder when you sit next to them but I'm so used to it that I don't think about it.