GK’s RB Series has been setting the standard for analog bass amplification for over three decades. G.I.V.E. Technology (Gate Induced Valve Effect) is integrated into the design of all RB Series heads allowing them to deliver a warm, punchy tone with a fast transient response that not only sounds better, it feels better. GK’s renowned voicing filters and intuitive four band active EQ make it simple to dial in a great sound.