AmpRX BrownBox Tube Amplifier Input Voltage Attenuator Octave & Harmonizer With its small footprint

With its small footprint

more expressive sound with rich harmonics

pickups and endings can be used as real autonomous phrasings without ever being repetitive

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

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

AmpRX BrownBox Tube Amplifier Input Voltage Attenuator Octave & Harmonizer With its small footprintBrownBox 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