The Universal Audio OX Amp Top Box is a premium recording system and reactive load box, allowing guitarists to play and record their tube amp in its ideal sweet spots—from the edge-of-breakup to fully cranked—at any volume level, and with instant album-quality mic, room and speaker cabinet emulations at the turn of a knob.

Featuring Universal Audio’s breakthrough Dynamic Speaker Modeling, OX emulates speaker breakup and cone cry like no other box on the market. It’s the world’s finest boutique speaker attenuator and guitar amp recording solution—overbuilt for years of home and studio use.