Helicopters Flying Too Low?

It occurred to me that another reason for the severity of the helicopter noise is that they fly much lower in Pasadena compared to elsewhere. The new "quiet knight" helicopters , which the city council has blindly put their faith in b/c some marketing guy came up with a slick name, seem to create even more vibration than the standard vietnam era copters.

So in addition to less helicopters, higher flight patterns Capt. Mulhall!