Sounds of Power Meters are similar to sounds of Bosnian Pyramids

power meter sounds are similar to Bosnian Pyramid sounds

power meter sound
3:10 into
https://www.youtube.com/watch?v=dW2AsO6  Z-Uo

bosnian pyramid sound
2:02:20 into
https://www.youtube.com/watch?v=CPNVQD5  TSYU