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Universal Audio OX Amp Top Box


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MSRP: $1,629.00 $1,299.00 Save : $330.00 (20%)
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MSRP: $1,629.00 $1,299.00 Save : $330.00 (20%)
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Get the Ultimate Tone From your Tube Amp — Anywhere, at Any Volume. For those wanting legendary album tones from their tube amps, Universal Audio proudly introduces OX Amp Top Box.

OX 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.

Now You Can:
  • Get the ultimate tone out of your tube amp — anywhere, and at any volume
  • Pair your amp to the world's best reactive load, with boutique UA analog quality — built for years of home and studio use
  • Instantly audition dozens of album-quality mic and guitar cabinet setups with front panel "Rig" control
  • Get authentic "edge of destruction" tones complete with speaker breakup and cone cry, thanks to UA Dynamic Speaker Modeling

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.

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 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.

Dynamic Speaker Modeling
UA’s groundbreaking Dynamic Speaker Modeling faithfully emulates speaker breakup, drive, and cone cry — an essential ingredient to organic 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 WiFi — letting you tweak, store and recall hundreds of presets from your iPad or Mac. You can then save your six favorite 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.  

  • 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 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 Modeling emulates speaker drive, breakup and cone cry  
  • World-class Universal Audio EQ, compression, delay, and reverb effects built-in
  • 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

Get your Universal Audio OX Amp Top Box today at the guaranteed lowest price from Sam Ash Direct with our 45-day return and 60-day price protection policy.


by PowerReviews
Outputs Balanced TRS line outs; S/PDIF digital outs; Headphone out
Weight 15.7 lbs
Controls Front-panel “Rig” control for instant, album-quality mic and speaker cabinet emulations
Dimensions 10.75"H x 12.25"L x 20.13"D
Effects Audio EQ, compression, delay, and reverb effects built-in
Impedence Selectable 4, 8, and 16-Ohm operation
Warranty Info:

One Year Parts and Labor Warranty