That sounds like it might be a chirp in the fan. Turn the fan off and see if it goes away.
Any chance it is coming from the centre speaker? That speaker is a known weakness in our audio system. Many (including myself) have replaced it with a non-paper cone speaker to prevent warping from moisture. Symptoms are static noise and garbled speech from Nav.
difficult to make out, but like @Adventureboy said. the center speaker is prone to go bad. I replaced mine on 21MME premium last year. play with sound settings (surround vs stero and left to right balance) and see if things change.
swapping the speaker is quite simple: pop th ecover off, uncrew speaker cone and unplug.
Remember to ask others driving in the same car to point out where the sound is coming from, they may point in a stunningly different direction, one which you find “inconceivable”!