OX Amp Top Box
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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
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.
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
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
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.
“OX does not disappoint. The room mics give your recorded tones character and realism, and the delays and the plate reverb sound expensive. It's easy to use, yet deep, and most importantly, fun. UA has hit it out of the park with OX!”
– Pete Thorn (Don Henley, Melissa Etheridge)Watch The Reviews
![Introducing OX | Amp Top Box from Universal Audio]()
Introducing OX | Amp Top Box from Universal Audio
![UNIVERSAL AUDIO OX demo by Pete Thorn]()
UNIVERSAL AUDIO OX demo by Pete Thorn
![Adventures With UA OX Part 2: Dan & Mick Record Songs At Real World Studios! – That Pedal Show]()
Adventures With UA OX Part 2: Dan & Mick Record Songs At Real World Studios! – That Pedal Show
![Universal Audio OX Amp Top Box Demo Video by Shawn Tubbs]()
Universal Audio OX Amp Top Box Demo Video by Shawn Tubbs
![That Pedal Show – Adventures With Universal Audio OX Part 1]()
That Pedal Show – Adventures With Universal Audio OX Part 1
![Universal Audio OX Reactive Amp Attenuator with Speaker Emulator | Reverb Tone Report]()
Universal Audio OX Reactive Amp Attenuator with Speaker Emulator | Reverb Tone Report
![Hendrix |]()
Hendrix | "The Wind Cries Mary" SOLO SOUND | Tim Pierce | James Santiago I OX
![UA OX • Unboxing • Playthrough • Impression]()
UA OX • Unboxing • Playthrough • Impression
![UA OX Amp Top Box Pete Thorn FIRST IMPRESSIONS]()
UA OX Amp Top Box Pete Thorn FIRST IMPRESSIONS
OX App & Manual
Customer Reviews
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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
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Customer Reviews
OX Amp Top Box
T. Hagemeyer
ox - top built, top features and 'amp' top box!
everything you need to work without physical cabs and mics
J. Perez Garcia
OX BOX
I am more than happy with what I can do with the OX, it exceeded my expectations and I am now getting the most out of my tube amps.
P. SHERIDAN
Universal Audio Ox
There is nothing that compares to the raw sound of a qualitative tube amp ramped up into good speakers. There are few venues, homes, apartments or even stages where you can get away with the volume to access that amp 'bloom'. The Ox attentuation, for my ears, is an excellent tool to do just that. Its like finally having the keys to a door that is usually kept locked.
On the speaker modelling side, I generally can't stand in-ears or modelling amps that attempt to emulate...yes they work well and get the job done, but the the tone (and feel) just does not match the real thing. I do have to admit, the Ox speaker emulator, coupled with a real tube amp... works. The digital speaker tones I.M.H.O. are point on and the microphone placement/room options are as good or better to a pro studio level. Very cool.
My only suggestion/preference is the proprietary power supply cable. It would be better to move that inside the box and have a simple external IEC connector just to reduce parts and pieces that can get lost in an arbitrary gig bag or studio cable bundle.D. Parrish
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
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
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 ballT. Gschwendner
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
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
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
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
I can make the sound I thought.
It's a wonderful equipment that can make the sound you think.
D. Cohn
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
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
Top Sounds With Top Gear
Expect a lot from the OX but this is really good. Usable FX and Easy to Use
F. Doria
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
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
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
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
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
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 (!!!)
