Ol’ Thumpy, a dual Helmholtz resonator headphone, was designed by Philip from Pud’s Small Batch Headphones YouTube channel. Two large spheres sticking out of each driver enhance the bass. The ...

occaisionally used to "tune" a recording studio or concert hall by reducing the space's resonance in that particular frequency range. may be referred to as a "bass trap" in music studios as Helmholtz ...