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

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.

Play and record your tube amp in its tonal sweet spot — anywhere, at any volume, with full dynamics

Get stunning mic and guitar cabinet combinations at the turn of a RIG knob — no miking required

Audition, tweak, and save more than 100 jaw-dropping custom Rigs from compatible iPad, or Mac/Windows computers.

Get authentic “edge of destruction” sounds, complete with UA Dynamic Room Modeling, speaker breakup, and cone cry

The World’s Best Reactive Load Box

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

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

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.

All The Right Connections

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. 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

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.


Watch The Reviews

      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 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

      OX App Requirements

      OX Amp Top Box

      2.4 GHz Wi-Fi network with internet connection to register (once only)

      (iPad) iOS 12 or iPadOS 13

      (Mac) macOS Mojave or Catalina

      (Win) Windows 10 64-Bit Edition

      Customer Reviews

      OX Amp Top Box

      Overall Rating

      4.2/5
      (195)

      D. Parrish

      November 4, 2024

      Why can't people upload their own IRs?

      For how expensive this unit is, there should be an option to load 3rd party IRs. I truly don't understand the thought process behind this decision to leave this option out as a basic feature. I wasn't aware of this limitation when I purchased it and now I kinda wish I went in a different direction. I feel like this is an incredibly easy thing to fix and would make this unit basically perfect if they gave the ability to load 3rd party IRs.

      You have to select "Direct" as one of the mic choices in order to bypasses the OX Box's built in IRs. You still need a secondary product in the signal chain such as an IR loader in order to do what almost all other reactive load boxes on the market can do natively.

      Please update the firmware with the ability to load our own IRs. It's past due.

      R. Thurn

      November 1, 2024

      No Backup, no Import, no Export! Sorry is 2024

      Please give us a update to backup our created rigs. Import and export files is normal for 2024

      R. Duffield

      October 14, 2024

      Love My OX BOX

      Guys i really do love it , how about even the smallest software update , add a mic or an effect or even one cab .. to show us that you love it too !!! its been way too long guys - love me some UAD but do you ??

      the product itself is 5 stars to be honest but only 3 for this review as someone dropped the ball

      T. Gschwendner

      October 9, 2024

      Great sounds, but...

      obviously a product, that was abandoned by Universal Audio. No updates to the app for more than two years, no new cabs, check out the forums, if you want to read about WiFi problems. Quite a shame.

      P. Chandler

      October 3, 2024

      I sold my Kemper and now back to using tubes.

      I sold my Kemper and am now back to using tube amps, thanks to the Ox Box. It provides exactly what I need: real tube sound at apartment-friendly volume.

      P. Chandler

      October 3, 2024

      I sold my Kemper and now back to using tubes.

      I sold my Kemper and am now back to using tube amps, thanks to the Ox Box. It provides exactly what I need: real tube sound at apartment-friendly volume.

      H. Pamminger

      September 15, 2024

      Ox what else?

      Playing tube amps at home can be of a challenge > it might get cloud. The way UA creates an answer with the Ox is simply great. It even goes further by providing this app based concept with various possibilities to discover guitar music - thanks!

      N. Oku

      June 1, 2024

      I can make the sound I thought.

      It's a wonderful equipment that can make the sound you think.

      D. Cohn

      April 28, 2024

      Game Changing Gear

      Believe the hype. OXBOX is is Swiss Army Knife of tone shaping tools. I've particularly enjoyed using it as in interface during rehearsals, allowing me to have some room tone while getting a perfectly recorded, pefectly isolated signal. Great piece of kit.

      R. Duffield

      April 7, 2024

      Every Day Piece

      Could not live with out it , need a second one actually !!! one thing its time for even just a small update to say we have not forgotten ... its time guys ..

      H. Nuesink

      March 15, 2024

      Top Sounds With Top Gear

      Expect a lot from the OX but this is really good. Usable FX and Easy to Use

      F. Doria

      March 15, 2024

      great sounds but constant connection problems

      great sounds but constant connection problems. Considering the cost it is a problem that needs to be solved.

      M. Balanky

      March 1, 2024

      It's been disappointing. I hear crackling on the high end that isn't present in real life. Amps have less headroom in the OX than real life.

      I'm still trying to work through the issues, but there is an artificial break-up distortion on the high end that seems to be input overload, even when my meters are all green. I've tried it with single-ended amps, so there is no chance of an issue from mismatched tubes that the support talks about.

      It works to play quietly at night and I'm in the middle of using it to record an album, but the amps don't sound the same as they do in the room with the same mic and speaker as modeled on the OX. I bought a second one to verify and they both have it. I've heard it on other people's YouTube videos now that I'm aware of it. It is not a silver bullet.

      Besides the artificial distortion I hear, the amps don't seem to have the same amount of headroom as they do in real life. This causes me to find new tones instead of using settings that make tones I like in real life. So, it is like relearning how to ride a bike, which is a drawback. I've troubleshot the thing to death - impedances are matched, tubes are good, tried a new spdif cable, power supply, new ox, verified metering, etc. I sent a sound file to UA, and the support person told me they didn't hear anything. My wife, not a musician, can hear the crackle. ...

      M. Power

      February 25, 2024

      A Dino get's to keep his stuff.

      I'm older, just turned 50, and I've been recording rock guitar since I was 15. I love tube amps and I always go for the 100W tube heads cause I'm a gear snob.

      My Ox Amp Top Box's attenuator is as good as, or better than any attenuator I've owned and being a 100W Gear Snob, that was a few of them. It's sounds great and I forgot I was playing through it within 30 secs and strapping my guitar on.

      The part that blew my mind was the recording capabilities!

      I've really tried to like plugins, and some are pretty good...until I do something that requires rolling off my volume to clean up my sound (Not much of a channel switcher) The plugins just couldn't react well.

      Now, I can run a maxed 2203 and record, with exceptional quality, using headphones at 3 AM.

      PS: The cab emulation is fantastic. When I record, it doesn't even dawn on my that it's software.

      No more words needed.

      My Ox Box is now a permanent fixture in my studio space.

      J. Morales

      February 21, 2024

      Great experience!

      Perfect for record or practice. My full band practice in Luna with headphones. Make more easy for the drummer follow the guitar when track by headphones using a JCM 800. I love it!

      M. Pointon

      February 2, 2024

      Just great

      I've not used this as an attenuator so can't talk about that. I use this for recording and it's just amazing

      R. Thurn

      January 17, 2024

      Ox Box - Perfekt für zuhause!

      Endlich bin ich wieder bei echten Amps und habe die 100000fachen Versuche, dass der Kemper gut klingt, aufgegeben. Kabel rein und aufdrehen. Mit der Ox Box zuhause nicht nur kein Problem, sondern PERFEKT (!!!)

      S. Saied

      January 3, 2024

      Connection Issues

      I love the UA products and I love my ox box, but I really don’t understand the implementation of this Wi-Fi connectivity that you have to go through with the ox box. Why didn’t they implement a USB type connectivity to the computer or even thunderbolt because it was out when the aux came out. another concern as I dropped nearly $1500 on this ox box and there’s been no firmware updates for at least two years years now. Being a software developer and engineer, I know there’s hardware limitations with the Wi-Fi but there’s a USB port on the box, so why not develop software that can utilize that now that technology is moving on with Wi-Fi technology? Eventually you’re not gonna be able to connect your Ox box at all which means you won’t be able to alter any presets.

      R. TARIEL

      December 20, 2023

      Mon meilleur achat

      Je suis tout simplement bluffé par la qualité sonore exceptionnelle qu'il offre.
      C'est sans aucun doute le meilleur achat que j'ai effectué depuis longtemps.
      C'est le compagnon idéal pour tout guitariste cherchant à obtenir un son pro avec ses ampli.

      A. Hathot

      December 10, 2023

      Perfection

      The only downside is that will make you spend money on more analog amps :)