AmpRX BrownBox Tube Amplifier Input Voltage Attenuator Octave & Harmonizer producing a consistently balanced sound

producing a consistently balanced sound and making it an excellent choice for a great variety of players

compact combo is a speaker system engineered for acoustic instrument reproduction that is based upon our revolutionary Bass Array® format from our bass guitar cabinet designs

you have the same direct control found on high-end controllers and standalone audio players

Keeley’s veteran crew builds the most reliable and road-worthy gear

AmpRX BrownBox Tube Amplifier Input Voltage Attenuator Octave & Harmonizer producing a consistently balanced soundBrownBox was created to provide a safe range of voltage reduction levels for vintage tube amplifier designs. The same, era correct voltage levels that the amps were designed around. The dynamics of a vintage amp supplied with the proper line voltage are optimized and will sound and respond as originally intended, revealing the circuits true harmonic content. This is the starting point, the basis of the signal chain, and where serious musicians begin