Some of this is in the lower audio and even infrasonic frequencies
. While many improvements in airfoil design have been made over the last 30 years to reduce blade noise, some of it remains.
From the infrasonic frequencies
(below human hearing) of baleen whales to the ultrasonic frequencies (above human hearing) used by toothed whales, the vocal and hearing range of whales is impressive, but it wasn't always so.
According to simulation results, frequencies of first 4 orders were in the range from 11.798 to 22.01 Hz, which is in the range of infrasonic frequencies
. Sounds in this range are not audible to human ears, and there has not be any acoustic analysis research focusing on infrasonic components of human snore sounds.
A multidimensional evaluation method for the psychological effects of pure tones at low and infrasonic frequencies
. Journal of Low Frequency Noise, Vibration and Active Control, 5(3), 104-112.
The routine up-and-down movements of the waves act as a giant loudspeaker, pushing the air at infrasonic frequencies