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OX Amp Top Box

$1,874 MSRP

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OX Amp Top Box
OX Amp Top Box
OX Amp Top Box

OX Amp Top Box

4.2 (153)

Get legendary studio tones from your tube amp — anywhere, at any volume.

  • 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
Sweetwater Sound Guitar Center Musician's Friend American Musical Supply Vintage King Amazon Zzounds Alto Music Sam Ash Perfect Circuit
Details & Downloads

Downloads

Download OX App

Download OX Manual

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

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.

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” 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.

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 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.

What They Say

OX does not disappoint. The room mics give 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

OX is a true game changer. New uses for it literally pop into my head every day. It’s head-and-shoulders above any product of its kind. For any guitarist who records his own tracks, OX is essential!

Josh Smith

Taylor Hicks, Raphael Saadiq

I can use OX on the most critical piece of music and be 100% happy. The UA team knocked it out of the park with this genius piece of gear. It’s perfect for the hobbyist in a bedroom, to the highest professional environment, be it studio or stage. Yes, OX is that good!

Lyle Workman

Beck, Sting

It is a neat single‑box solution, optimised for both stage and studio; simple in its most basic function, yet deep when you want it to be.

For attenuation, sending the best possible sound to a PA desk, home practising with an inspiring tone and easy recording, the OX [Amp Top Box] offers a one stop solution that's hard to fault.

Unsurpassed effects, intuitive operation, and a diverse set of speaker emulations elevate this top box to industry standard status.

The OX is a brilliant solution for recording guitars, even if you own a solid mic selection and a beautiful room to record in.

UA Studio Sessions

Reviews

4.2
Rated 4.2 out of 5 stars
Based on 153 reviews
Total 5 star reviews: 93 Total 4 star reviews: 28 Total 3 star reviews: 16 Total 2 star reviews: 6 Total 1 star reviews: 10
79%would recommend this product
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153 reviews
  • DC
    D. C.
    I recommend this product
    Rated 5 out of 5 stars
    11 months ago
    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.

    Was this helpful?
  • RD
    R. D.
    I recommend this product
    Rated 5 out of 5 stars
    1 year ago
    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 ..

    Was this helpful?
  • HN
    H. N.
    I recommend this product
    Rated 5 out of 5 stars
    1 year ago
    Top Sounds With Top Gear

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

    Was this helpful?
  • FD
    F. D.
    Rated 3 out of 5 stars
    1 year ago
    great sounds but constant connection problems

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

    Was this helpful?
  • MB
    M. B.
    I do not recommend this product
    Rated 2 out of 5 stars
    1 year ago
    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. ...

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Frequently Asked Questions

UAFX pedals require an isolated 9 volt DC, center negative, 2.1 x 5.5 mm barrel connector (same as standard Boss connectors) power supply that can provide the following current requirements: Full-sized UAFX pedals (with two footswitches) require 400 mA (milliamps) of current; Compact UAFX pedals (with a single footswitch) require 250 mA (milliamps) of current

Connect the pedal using a USB-C cable to your compatible computer, and run the UA Connect application to update your firmware.

You can register your pedal with the UA Connect desktop app or the UAFX Control mobile app.

Dual footswitch UAFX pedals have Bluetooth, and you can download the UAFX Control mobile app from the Apple App Store or Google Play Store, to connect to your pedals and access additional functionality.

Each UAFX pedal has unique functionality. We recommend carefully reading the accompanying manual for each pedal here.

Check our Knowledge Base for additional questions

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