Join Date: Feb 2018
Location: Dresden, Germany
Welcome to the forum and enjoy your new Compass!
Some say, the humming sound appears when the driveshaft for the rear wheels is disconnected.
When the Compass starts from a standstill, it's using all for wheels. When reaching the mentioned speed and traction is sufficient, it disconnects the rear wheels. Next time you realize that sound, you can either put your shifter into manual mode or push the Selec-Terrain knob. If you do so, the humming should disappear.