#flutter echo

Japanese music promotion company Chaotic Harmony will release their first omnibus album, titled Chaos Collection in December. Crowdfunding is currently underway via Indiegogo, with multiple price points and upgrades available. Chaos Collection gathers 13 bands representing the Japanese rock and visual kei scene, including names like heidi., THE SOUND BEE HD, and DaizyStripper. Each band…

This phenomena occurs when you have surfaces arranged to face each other with low acoustic absorption. When these surfaces are far enough apart, the sound of each reflection becomes audible, forming this strange, layered effect that is usually seen as undesirable when designing acoustic spaces

The video through this link shows that, while the man is speaking, the reflections culminate in a reverb-like effect to the listener, but when the man claps (an impulse) an echo is perceived.

The first reflection after the impulse must arrive more than 1/15 of a second after the wavefront of the impulse for there to be a perceived echo, and given that the speed of sound in air is around 343 metres per second, the space in this hall must have reflective surfaces facing each other with at least 17m of distance in between.