[FiatLuxDave]

Big powerful lasers can actually be quite noisy. Once I was talking on the phone with a friend who was working on one of the big lasers (don't remember which one, but it was in the bay area) and he said,"What? What? I'm sorry I can't hear you over the sound of my laser!". When he could hear me, I told him that was one of the coolest things I'd ever heard anyone say.

[chneu]

It's usually the accessories and support equipment that makes lasers loud. Cooling equipment, electrical stuff, etc.

If those can be put in another room then the noise goes way down.