"20 Hz" is a creepy short horror film, best described as a cross of “Ghost Hunters” and Pulse. The film follows a woman wring a song when she begins to hear an eerie sound through her headphones. Intrigued, she investigates. The story centers around the sounds that loom just out of our range of hearing. It's short, but it packs a punch.
"Human hearing is capable of detecting sound waves between 20 and 20.000 Hz. … merely a small fraction of the frequency spectrum."