Here are the sounds of a HyperDimensional Resonator (HDR) created by Steven Gibbs.
The sounds are faint, they were captured using a neodynium microphone.
It sounds like a motor & a Tesla coil?
Very Curious…
CarlosX
It sounds like 60-cycle hum to me…
were you using it plugged into a wall plug or were you using a dc-ac converter?
Rykel