20 Hz
IMDb6.01080P20155 min
Human hearing is capable of detecting sound waves between 20 and 20.000 Hz. … merely a small fraction of the frequency spectrum. Most sounds around us go unnoticed.
- Country: United Kingdom
- Genres: Horror
- Released: 2015-05-19
- Directors: Chris Keller
- Casts: Alix Wilton Regan