Where I live -near Camberley there are overflights in all directions but seldom here much jet noise from anything high up=-turboprops are another story and can sound very loud, lots of FlyBe in and out of Southampton , Mil to and from Brize and the random tramping Antonovs . Are turboprops louder because of
a) the low frequency of the prop noise
b) Just because they cruise in FL 20s not FL30s
Anyone enlighten me please
PB