In your Raven II CAA paperwork is a noise certificate - which should contain a ratified figure that is way below the acceptable thresholds.
In my experience the worst noise from approaches and landings in R44s comes from the tail rotor. If you can keep your approaches & departures into wind for as long as possible, if you can do approaches with minimal power and blade slap, you will keep everyone happy.
I was in a very peaceful place last weekend with a group of 44s - and we felt guilty everytime we started up. But with some sensible planning for departures (max ROC, get the height and get away) and approaches (keeping out of blade slap, approaching into wind with minimal power) and only ground-running for the minimum possible time : we made way less noise.
On departures, the difference in noise between a machine being flown in accordance with the string and one that has its pedals in the wrong position is immense.