Experience the searing high-gain tone that powered legendary alt rock and metal bands from Foo Fighters and Incubus to Metallica, Tool, and more.*

Giving you six classic mic and speaker pairings, built in TS-style OD/boost, and noise gate, Knuckles '92 puts the authentic genre-defining sound of one of the most ferocious high-gain amps ever made under your boots.

Plug into the California King of High Gain

Whether you seek the gritty power chords of punk and alternative anthems by the likes of Dave Grohl and Incubus or the complex aggression of bands like Metallica and Dream Theater, Knuckles '92 puts one of the most versatile multi-channel amps ever made right on your pedalboard.*

Explore a Range of Rectifier Tones

Use the famed green, orange, and red channels to explore perfect cleans to bone-crushing crunch and smoldering lead sounds. Then experiment with EL-34 or 6L6 power tubes and switch between solid-state or tube rectifiers for ultimate control and feel under your fingertips. 

Play Through Perfect Preamp Boosts

Knuckles '92 is equipped with a classic TS-style overdrive — a tried and true component for tight, articulate playing — and an integrated preamp boost that’s famous for sculpted modern metal tones. And its built-in noise gate gives you clear sound even at face-melting gain levels.

Get Six Epic Mic & Speaker Pairings

With six mic and speaker pairings used on countless iconic records, Knuckles '92 captures the full essence of playing through one of the greatest aggressive guitar amps ever made.

Customize Your Sound with the UAFX Control App

Unlock deep customization with the UAFX Control mobile app. Tweak hidden controls, save boosts and noise gate settings, and even change output tubes and rectifier modes. Plus, explore artist presets crafted by the world's top metal guitarists and dual-rec specialists.