Universal Audio OX Amp Top Box

Get Legendary Studio Tones from your Tube Amp — Anywhere, at Any Volume.

Universal Audio OX Amp Top Box is a premium reactive load box and guitar recording system, giving you perfectly studio-miked amp sounds from your favorite tube amp. OX lets you play and record your amp in its sweet spots — from huge clean tones and edge-of-breakup to fully cranked — at any volume level, and with mic, room, and speaker cabinet emulations at the turn of a knob.

Featuring Universal Audio’s breakthrough Dynamic Speaker Modeling, OX is the first system to accurately emulate speaker drive, breakup, and cone cry — making it the world’s finest speaker attenuator and guitar amp recording solution.

UA OX Amp Top Box Features:

• Premium, no-compromise analog reactive load box and guitar recording system for tube guitar amps
• Instant album-quality mic and speaker cabinet tones via front-panel “RIG” control
• Get record-ready sounds quickly with expertly-placed virtual mics — no miking needed
• Five finely-tuned amp attenuation levels — from off to whisper quiet to full band volume
• UA Dynamic Speaker Modeling emulates speaker breakup and cone cry
• Choose from 22 speaker cabs, six cabinet mics, and six room mics
• Studio mixer with 2 independent close mics, and stereo room & mic modeling
• Hands-free toggling of OX's studio-grade EQ, compression, delay, and reverb with up to three external footswitches
• Selectable 4, 8, and 16-ohm operation
• Front-panel Headphone out for silent practice with cranked tones
• Balanced TRS line outs and S/PDIF digital outs for stereo recording
• Pair with OX app (Windows 10, iPad, or Mac) over Wi-Fi for editing and saving presets

The World’s Best Reactive Load Box

With decades of analog hardware engineering expertise, Universal Audio’s dream team of engineers set out to design a reactive load box that retains the tone, dynamics, and feel of your tube amp — no matter how much it’s attenuated. The goal was for your tube amp to “see” OX as an actual speaker — with continuously variable impedance and response — so you don’t lose a drop of tone or playing dynamics.

A Complete Guitar Recording System

OX’s front-panel, six-position RIG control allows you to quickly choose from complete setups — including emulated speaker cabinets, close mics, ambient room mics, and up to four simultaneous studio effects. OX is also the only guitar recording system to offer a complete selection of expertly placed room mics, giving you the authentic experience of pushing air while recording your cranked amp in a world-class tracking room. OX Amp Top Box 6 Welcome to OX Amp Top Box!

Dynamic Speaker Modeling

UA’s groundbreaking Dynamic Speaker Modeling faithfully emulates speaker breakup, drive, and cone cry — an essential ingredient to authentic tube amp tones. Using the Speaker Breakup knob in the OX app, you can control the harmonics and sonic complexity that occurs only at certain frequencies and volume levels on various speakers — far beyond a static Impulse Response system — giving you the same sonic phenomenon that occurs with a real speaker cabinet.

A Beautiful Software App

Most guitar products do digital awkwardly. They’re ugly and hard to understand. The OX software app, on the other hand, offers slick, intuitive control over all of OX’s RIG settings via Wi-Fi — letting you tweak, store and recall hundreds of presets from your iPad and Mac/Windows computer. You can then save your six favorite tones onto OX’s front-panel RIG knob for instant recall in the studio or at a gig.

The Right Connections

Not only does OX Amp Top Box feature a front-panel headphone jack for silent practice with your cranked tube amp, it also sports a bevy of connections for all kinds of recording and live workflows. Stereo S/PDIF digital outputs via RCA and optical TOSLINK, as well as balanced TRS stereo line outputs with front panel level control, give you the necessary connections for studio monitors, DAW, or live mixing console inputs.