Sonus faber Gravis III Subwoofer Review Tyler StripkoNovember 22, 2021 If you are tired of the typically boring “black box” subwoofer, Sonus faber has something for you. The “middle child” in Sonus faber’s new Gravis subwoofer lineup, the Gravis III, is a gorgeous, compact, and very musical subwoofer. Subwoofers