Universal Audio OX Amp Top Box Reactive Amp Attenuator with Speaker Modeling
5,695.00 Excl. VAT
- Reactive Load Box for Electric Guitar
- Get Loud Tube Tone at Soft Levels
- 4-, 8-, or 16-Ohm Operation
- Album-Quality Mic/Cab Models from UAD
- Front-Panel Headphone Output
- TRS Line Outputs for House PA or Mixer
- Optical/Coaxial S/PDIF Digital Outputs
- Corresponds with App over Wi-Fi
In stock
Get legendary studio tones from your tube amp — anywhere, at any volume.
Details
- 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
- Footswitchable control of OX’s studio-quality effects
Explore 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” Universal Audio OX Amp Top Box 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. Universal Audio OX Amp Top Box 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.
Shape Your Tone with 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.
Simplify with Complete Connectivity

Not only does Universal Audio 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. Plus, you can connect any one, two, or three-button footswitch and toggle OX’s studio-quality effects on and off.
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 favorite tones onto OX’s front-panel RIG knob for instant recall in the studio or at a gig.
| Weight | 8.98 kg |
|---|---|
| Dimensions | 54.61 × 33.782 × 28.96 cm |
| Type: |
Reactive Load |
| Power Handling: |
150W RMS |
| Impedance: |
4/8/16 ohms |
| Attenuation: |
5-way switch |
| Inputs: |
1 x 1/4" TS (from amp) |
| Outputs: |
1 x 1/4" TS (to speaker), 2 x 1/4" TRS (line/monitor), 1 x Coax (S/PDIF), 1 x Toslink (S/PDIF), 1 x USB Type B, 2 x USB Type A |
| Headphones: |
1 x 1/4" TRS |
| Other I/O: |
1 x 1/4" (foot control) |
| Features: |
IR Cab Models |
| Power Source: |
12V DC (1.5A) power supply (included) |
Related products
Universal Audio Apollo Solo USB Heritage Edition
- USB-C audio interface for Windows only
- 2 analog inputs and 2 analog outputs
- Sounds amazing, with next-generation AD/DA
- Use outstanding UAD Powered Plug-ins for tracking and mixdown
- Preamps sound pristine, and Unison technology
- Includes a premium plug-in suite of 5 award-winning UAD plug-ins
- USB 3.0 gives you ultra-low latency and huge bandwidth
Universal Audio Brigade Chorus and Vibrato FX Pedal
- Replicates the chorus and vibrato tones
- Chorus side captures the essence of the ’80s
- Vibrato side offers a slightly more out-there tone
- Features switchable analog preamp modeling for old-school warmth and harmonic richness
- Compact enclosure and extremely intuitive 3-knob, 1-switch setup
- Top-mounted controls for seamless integration into a pedalboard
- Toggleable true/buffered bypass operation
Universal Audio UAFX Del-Verb Ambience Companion Reverb and Delay Pedal
- Stereo reverb and delay pedal
- UAFX dual-engine processing
- Runs separate stereo instances of the reverb and delay sides for max depth and atmosphere
- 3 spot-on emulations of legendary reverb units
- 3 vintage-style echoes,
- Optional UAFX Control app
- Buffered bypass operation keeps your signal strong in long cable runs
Universal Audio UAFX Evermore Studio Reverb Pedal
Universal Audio UAFX Galaxy ’74 Tape Echo and Reverb Pedal
- Stereo reverb and delay pedal
- UAFX dual-engine processing
- Runs separate stereo instances of the reverb and delay
- Delay side contains all the wow, flutter, and preamp grit of the original unit
- 3-position Head Select switch and tape age knob
- Delay time is double the original unit
- Spring-style reverb adds a cascading splash to your tone
Universal Audio UAFX Heavenly Plate Reverb Pedal
- 1950s-style plate reverb inspired by UA’s Golden Reverberator
- Includes a trio of reverb voices: Vintage Dark, Vintage Bright, and Modern Full
- Straightforward and intuitive control section
- Modulation knob imparts a moody hue to your reverb
- 2-position switch to determine the speed of your modulation
- Trails/Bypass mode allows you to switch between true bypass operation.
Universal Audio UAFX Max Preamp and Dual Compressor Pedal
- Stereo dual compressor and preamp pedal with 3 classic compressor emulations
- A preamp modeled after the UA 610 tube preamp
- UAFX dual-engine processing delivers the highest level of sonic authenticity
- 3 classic compressor models to choose from
- Preamp knob captures the tube-style warmth and harmonic grit of the UA 610
- Dual compressor design, with 2 x 3-way switches
- Attack, Ratio, Release, and Comp controls, in addition to a 2-way Comp Select switch
Universal Audio UAFX OX Stomp Dynamic Speaker Emulator Pedal
- Dynamic Speaker Modeler Stereo Pedal with 22 Cabs, 6 Mics
- Up to 3 microphones emulations can be dialed in at once
- UAFX Control app offers a wealth of effects to choose from
- 6-position Rig knob
- Second footswitch can be configured to function as a mirror to the A footswitch
- Includes 100 expertly curated rig setups for track-ready tones right out of the box
- Analog dry through to keep your dry signal pure when the effect is disengaged
