GRBass is an Italian bass amplification company based in Monopoli, in the Puglia region, founded by Gianfranco Rizzi and operating under the GR Audio s.r.l. entity. The brand builds bass amplifier heads, cabinets, combos, and accessories in Italy under the tagline "Pure Sound," with a design philosophy focused on uncolored tone and high performance-to-weight ratios.

The company is best known for its AeroTech cabinet line, which uses carbon-fiber construction to produce some of the lightest bass cabinets on the market, as well as amplifier series including the GROOVE, ONE, 700/700+, and DUAL 1400. A sister division, GR Guitar, extends the same lightweight cabinet approach to acoustic, FRFR, and electric guitar rigs. All products carry a five-year warranty.

GRBass has built an international endorser roster of bass players, including session veteran Leland Sklar, Italian virtuoso Federico Malaman, Wojtek Pilichowski, Igor Saavedra, and Eugene Abdukhanov of Jinjer, among roughly sixty artists spanning Italian and international scenes.

GRBass has 7 products cataloged on Equipboard, including Bass Amplifier Cabinets, Bass Amplifier Heads, and Bass Combo Amplifiers. Their gear is featured by 1 artist, with the strongest followings in Rock and Metal. Notable users include Yuchi.