Infrasound is about a specific frequency range of sound which isn't audible but still carries energy (which is why it can be dangerous). This article was about

Infrasound is about a specific frequency range of sound which isn't audible but still carries energy (which is why it can be dangerous). This article was about a wideband sound that was so loud that it defies comparison. Loudness is related to the amplitude, or "height" of the wave, not frequency.