4:06
EMF buzzing magnetic field tone from an Xbox One X - data idle, run, power up and down - variety.
0:59
EMF buzzing magnetic field tone from a Universal Audio Apollo Twin - power up and down 2.
0:55
EMF buzzing magnetic field tone from a Universal Audio Apollo Twin - power up and down 1.
4:52
EMF buzzing magnetic field tone from a London passenger train - electromechanical intense power rumble - thin.