Pricing and availability
We compare 600+ stores and found this item at 10 stores. Prices updated .
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Reviews
Price
Average Price: $1,399
High-end/Boutique
$299
$600+
Price Tier
Budget
Standard
High-end
Price History
Based on price data from 8 merchants for "Universal Audio OX". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.
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Description
Experience the ultimate tone from your tube amp with the Universal Audio OX, a top-tier reactive load box designed for guitar enthusiasts. This revolutionary device allows you to play and record your tube amp in its sweet spot, from the edge-of-breakup to full throttle, at any volume level.
Unleash your amp's full potential without worrying about noise complaints, thanks to the OX's superior attenuating capabilities. With its Dynamic Speaker Modeling technology, the OX faithfully emulates speaker breakup and cone cry, providing an unparalleled level of sonic detail and responsiveness.
The front-panel "Rig" control offers a vast selection of mic, cab, and studio effect setups, covering everything from vintage to modern tones. Whether you're practicing silently with headphones or recording directly into your DAW, the OX ensures your tone remains consistent and authentic.
Key Features:
- Premium reactive load box for tube amplifiers
- Five finely-tuned guitar amp attenuation levels
- Dynamic Speaker Modeling for realistic speaker emulation
- Front-panel "Rig" control for a variety of mic and cab setups
- Includes UA's world-class EQ, compression, delay, and reverb effects
- Selectable 4, 8, and 16-Ohm operation
- Balanced TRS line outputs, S/PDIF digital outputs for recording
- Front-panel headphone output for silent practicing
- Wi-Fi connectivity for remote control via OX app (Windows 10, macOS Sierra, or High Sierra)
- Can store and recall up to six rig settings
- Footswitch connectivity for hands-free control
Product specs
| Available since | January 2018 |
| Impedance | 4, 8, 16 |
| Noise Supression | No |
| DI Interface | Yes |
| Speaker Simulation | Yes |
| Dummy Load (usable without cabinet) | Yes |
FAQs
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What is the primary function of the Universal Audio OX Amp Top Box?
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The Universal Audio OX Amp Top Box is a reactive load box and guitar recording system that allows you to achieve studio-quality mic'd amp sounds from your tube amp without needing to crank up the volume.
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Can the Universal Audio OX be used with different impedance levels?
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Yes, the Universal Audio OX supports 4, 8, and 16 ohm impedance levels, making it compatible with a wide range of amplifiers.
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Does the Universal Audio OX include speaker simulation?
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Yes, the Universal Audio OX features built-in speaker simulation, allowing you to choose from various speaker and mic models for versatile tone shaping.
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Is the Universal Audio OX suitable for silent recording?
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Yes, the Universal Audio OX can be used as a dummy load, enabling silent recording without the need for a speaker cabinet.
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Does the Universal Audio OX have noise suppression capabilities?
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No, the Universal Audio OX does not include noise suppression features, but it excels in providing high-quality amp tones and recording flexibility.
Videos
Universal Audio
Introducing OX | Amp Top Box from Universal Audio
Introducing OX | Amp Top Box from Universal Audio
Universal Audio
UNIVERSAL AUDIO OX demo by Pete Thorn
Pete Thorn
That Pedal Show – Adventures With Universal Audio OX Part 1
That Pedal Show
Universal Audio OX Reactive Amp Attenuator with Speaker Emulator | Reverb Tone Report
Reverb
Universal Audio OX Reactive Amp Attenuator with Speaker Modeling Demo
Sweetwater
Universal Audio OX - Reactive Load Attenuator & Speaker Simulator Demo
Andertons Music Co
How To Use The Universal Audio Ox
Phillip McKnight
Is the Universal Audio OX BOX still worth it in 2023?
Scott Poley | Pedal Steel | Guitar
Is @UniversalAudio's OX Box Still Relevant In 2023??? Let's Find Out!
Peach Guitars
Reviews
PROS
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Unmatched sound quality from any attenuator
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Enables precise volume and gain control
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Exceptional headphone output sound quality
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Realistic and lifelike emulation for recording
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Easy setup and operation, suitable for immediate use
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Dual application usage for multi-device setups
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Reactive load and speaker/effects features enhance playability
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Extensive cabinet, mic, and room simulation options
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Allows silent playing, perfect for residential environments
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High-quality effects, including reverb, for recording and live use
CONS
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Occasionally inconsistent tone reported
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Volume control is stepped, not continuously variable
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Some users experienced connectivity issues with WiFi
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Concerns about lack of updates or support from Universal Audio
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External power adapter can be problematic
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Lacks a balanced line out for complete connectivity
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Speaker sound can be muffled with diminished mids/highs at low volumes
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Price point may be high for some budgets
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Inability to add custom impulse responses
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Software compatibility and app limitations for some users
Owner Insights
We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Universal Audio OX.
Features and functionality
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The OX Box excels in providing a range of great-sounding microphone and room simulations, ideal for recording without needing extensive pedal setups.
Source -
Owners appreciate the headphone functionality for silent practice, allowing them to use their amp heads without disturbing others, but cab emulation is necessary for headphone use.
Source -
The OX Box offers five set attenuation levels, which some users find limiting, wishing for a more continuous adjustment option.
Source -
The OX's impedance curve is less realistic, possibly to integrate better with built-in IRs, affecting power amp interaction.
Source
Use cases and applications
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It's particularly effective for cranked non-master volume amps, offering studio-quality tones without requiring an isolation booth.
Source -
For those wanting to record amps quietly, the OX Box is a standout choice but may be overkill for simple volume reduction needs.
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Users highlight the OX Box's effectiveness in live settings, sending amp tones directly to Front of House, while maintaining manageable stage volume.
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Users recommend using a U67/121 mic combo with the OX to mimic mic'd cab sounds for specific amp/cab configurations.
Source
Comparisons
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Users note that while the Two Notes Torpedo offers flexibility, the OX Box simplifies the process with consistently great tones, reducing time spent tweaking.
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Compared to the Boss Waza Tube Amp Expander, the OX Box doesn't re-amplify the signal, which some believe results in a thicker tone with the Waza.
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Compared to the Two Notes Captor X, the OX is preferred by some users for its lack of fan noise, especially noticeable when using high-wattage amps.
Source -
The Suhr Reactive Load offers a cost-effective alternative to the OX, allowing 96k recording unlike the OX's 48k limitation.
Source
Software and compatibility
User experience
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Some users experience digital distortion with high gain settings, indicating potential issues with the OX Box when using such setups.
Source
Critic Reviews
5.0 out of 5
Based on 1 Review and 10 Ratings
8686
amazing!!!
This is one of the most amazing processors I've ever played! It really cures a lot of my problems: - It has a great powerbreak function (limited, but works very well) - It has a great recording function - It has a great silent playing function (for when the kids are sleeping)
I've tried this against a lot of the other competitors in the market (as it is quite expensive), and as the other ones do produce similar products, one thing stands out: TONE! Really, this unit can get you a tone I couldn't get from any other unit. I can only describe it as being next to your amp without being next to your amp. It is really amazing.
I compared it to the Boss, the Torpedo, the Suhr, the Nux, the Strymon....... and these were no match for the Ox (and yes, I tried it in my own room with a lot of time to go in depth to the units). And although these units could come close, they never matched the feeling of the signal, the airy-ness of the signal and the lack of noise.
I enjoy using it with my vintage amps as it really makes the character of the amp stand out.
OK, one downside: when I tried to record some of my sounds I got a big dissapointment. The recorded sound (through my Focusrite with cables OR SPDIF) didn't sound anythink like the headphone output of the unit. I got mad finding a solution, and in the end I ended up buying a Universal Audio Volt 476 instead :) (btw, the trick is to pan both signals (line out 1 and 2) to hard left and hard right to get a similar signal)
Preferred Settings + Usage:
I really enjoyed preset 2 and 6 from the factory standards
Artist usage
Add artist
Billie has one sitting on his Marshall during the recording of Saviors.
In this picture we can see the uaudio OX above the mesa boogie amp head during the recording of the next Muse album
in the "Don't Fear The Reaper" section of the interview, the UA OX can be seen under the Fender Deluxe Reverb Amp in the image
In the video titled "Let It Be" by Mateus Asato on YouTube, you can see Mateus Asato using the Universal Audio OX, as the UAD reactive load is visible.
Extract from the interview: “I do have an OX. I didn't use it that much, I actually use that right now as a power soak more than anything so I can crank up my old Fenders. On the demos, really the only guitar sound I kept gravitating towards was UA’s ‘55 Deluxe plugin. And it’s an amazing plugin, it sounds just like an old [Fender] Deluxe.
"So what was interesting was I listened to the demos and I really liked the way that kind of amp sounds with these songs, so I went on a hunt for that particular era of Deluxes. I think it’s the 5E3 circuit. It’s very simple but it’s such an incredible sound. There’s a reason Billy Gibbons uses those and so many guys gravitate towards those amps.
“So I found one of those, my buddy Bobby at River City Guitars, I said, “Hey man I’m looking for one of these amps, can you round one up for me?” He found one that was in a studio over in Seattle and it’s pretty much the sound of this record.”
Can be clearly seen in this video by Fender
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A photo shows Toru Kitajima using the Universal Audio OX alongside a Twin Reverb amplifier.
At 1:53, you could see this above the amp
Richie Faulkner is seen using the Universal Audio OX atop his amplifiers in his home studio, as shown in various images on his Instagram.
Album Usage
The Universal Audio OX has been featured on the following albums:
Genre Usage
Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.
Used With
Based on how musicians on Equipboard use Universal Audio OX, it is most commonly used with the following gear.
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Community setups
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