Universal Audio Guitar Gear | OX Amp Top Box

OX is a premium reactive load box and guitar recording system, giving you perfectly studio-miked amp sounds from your favourite valve 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 Modelling, 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.

• Premium, no-compromise analog reactive load box and guitar recording system for valve 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 and cabs – no amp miking required
• Five finely-tuned guitar amp attenuation levels, from completely silent to whisper quiet to full band volume
• UA Dynamic Speaker Modelling emulates speaker drive, breakup and cone cry
• World-class Universal Audio EQ, compression, delay, and reverb effects built-in
• Footswitchable control of OX’s studio-quality effects
• 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 the OX mobile or desktop app over Wi-Fi for editing and saving RIG 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. Their goal was for your valve 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. 

Mission accomplished. Just plug your tube amp’s speaker output into OX, and then plug OX’s output into your cabinet, and you’ll enjoy your amp’s natural tone like never before. 

A Complete Guitar Recording System

OX’s front-panel, six-position RIG control allows you to quickly choose from complete setups – including 22 vintage and modern cabinets loaded with iconic speakers from Celestion, Jensen, JBL, and more – 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.

Dynamic Speaker Modelling

UA’s groundbreaking Dynamic Speaker Modelling faithfully emulates speaker breakup, drive, and cone cry – an essential ingredient to organic valve 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, Mac, or Windows 10 computer. You can then save your six favourite sounds onto OX’s front-panel RIG knob for instant recall in the studio or at a gig. 

All 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. S/PDIF RCA and optical TOSLINK digital stereo outputs, 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. Plus, you can connect any one, two, or three-button footswitch and toggle OX’s studio-quality effects on and off.