 Plasmacoustic meta-layers offer a new solution for controlling audible sound. These layers of air plasma can absorb sound over a wide frequency range from several hertz to the kilohertz range while being thin enough to fit into deep sub-wavelength spaces. The ability to control sound absorption over such a large frequency range makes these layers ideal for applications like noise control, audio engineering, room acoustics, imaging, and metamaterial design. This article was authored by Stanislav Sergave, Roman Flury, and Hefe Lisek.