There’s another resource describing fan and system curves here that will probably be found equally chewy, but hopefully informative/interesting…
But yes, to some extent a person may have options relating to the aerodynamics of a given fan; operation in or to the left of the “knee” of the fan curve as described there can result in more flow-generated noise than otherwise. A piece of clear tubing with some water and a ruler can be used to measure static pressure in a pinch, but it sounds as if you may have a situation that’s fairly low-pressure to start with.
Mechanical dampening may well help a bit, but if it’s that that hissing/white noise component of things caused by airflow itself that’s the problem, then a slower, lower-flow option would likely be the answer.