Universal Audio OX Amp Top Box Reactive Loadbox

The Universal Audio OX Amp Top Box is a premium reactive load box and guitar recording system built for players who want to capture their tube amplifier's best tones without the volume constraints of traditional miking. Unlike resistive load boxes that can alter the feel of your amp's power section, the OX uses a fully analog reactive load that maintains the dynamic interaction between your amp and the load, preserving the touch sensitivity, harmonic richness, and natural compression that make tube amps special. Five finely tuned attenuation levels let you go from completely silent direct recording to whisper-quiet late-night playing to full band volume, all while keeping your amp running in its sweet spot.

At the heart of the OX's recording capability is Universal Audio's Dynamic Speaker Modeling technology, which goes beyond static impulse responses to emulate how a real speaker cone responds to varying levels of power — capturing the drive, breakup, and cone cry that give a cranked amp its character. The front-panel RIG control provides instant access to a curated selection of speaker cabinet and microphone combinations, delivering album-quality tones with the turn of a single knob. For guitarists and recording engineers who want the sound of a fully driven tube amp captured through world-class virtual microphones and cabinets, the OX eliminates the need for loud amp stages, expensive microphone collections, and acoustically treated rooms.