Universal Audio OX Amp Top Box

Analogue Loadbox

  • Analogue reactive loadbox for guitar tube amplifiers
  • Five tuned guitar amp attenuation levels
  • Rig control for pre-set microphone and speaker box emulations
  • UA Dynamic Speaker Modelling accurately models the behaviour of a speaker and membrane resonances
  • Integrated UA EQ compression, delay and reverb effects
  • Ohm operation selectable (4, 8, and 16 Ohm)
  • Connectors: Line output 6.3 mm jack balanced
  • S/PDIF output
  • Headphone output: 6.3 mm jack
  • Pairing via WiFi with OX mobile or desktop app to edit and save presets (for Windows 10 and macOS: Sierra or High Sierra)

Further Information

Impedance 4, 8, 16
Noise Supression No
DI Interface Yes
Speaker Simulation Yes
Dummy Load (usable without cabinet) Yes

Silent-recording-solution for guitar players

In the case of the Universal Audio Ox Amp Top Box we are talking about an analog Silent Recording Box, which is peerless in terms of dynamics and sound fidelity and at the same time it also is a complete recording system for any tube amp. This combination does not only make it possible to play the amp in the sweet spot at every volume level, but also to record it simultaneously with the high quality Universal Audio microphone, room and speaker simulations. In addition, there is an easy to use and control Software-App, that can be used to make alterations in the operation and programming of the Universal Audio Ox Amp Top Box by way of Wi-Fi.

The Load Box

The Ox Amp Top Box is a high-grade, reactive load in a top format for tube amps, which gives guitarists the freedom, to play and record at any time and at any volume level. What makes it special: the Ox Amp Top Box is perceived as a real speaker thanks to the Dynamic Speaker Modelling Technology of the amplifier. It delivers the dynamics, the pressure, the playing sensation and the tone of the amplifier at every volume, like a real speaker. The Speaker-Breakup-control in the App manages the overtone structure and tone colour at specific frequencies or volume levels. All the levels of the headphones, connected speakers or Line-Out can be adjusted on the front of the device.

For low volume players and recording specialists

If you would like to coax the optimal sound out of your tube amp without the high volume level which is usually required, you will find that the Universal Audio Ox Amp Top Box is the perfect solution. In this way playing, practising and recording of the original Amp sounds at any time of the day or night is possible and no problem at all.

Your tube amp - always ready to rock

Trying out a riff idea at three in the morning? Playing guitar and perhaps recording right away, all without bothering housemates or neighbours? The Universal Audio Ox Amp Top Box delivers the real sound of connected tube amplifiers at every volume level, with or without speaker. On top of that, the authentic microphone, room and speaker simulations in the usual Universal Audio quality further expand the sonic possibilities many times over.

About Universal Audio

Universal Audio was founded in 1958 and stands for the development of groundbreaking Recording products. Since 1999, in the Californian Scotts Valley, you will find the descendants of the founder focusing on digital recording technology which intends to preserve the characteristics of analog sound tools in an unadulterated manner. Legendary are the UAD-Plug-Ins, authentic emulations of analog devices, which were created in cooperation with the manufacturers of the Original Hardware.

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Universal Audio OX Amp Top Box
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60 Customer Ratings:
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Top notch product that allows you to get the most out of your gear
TheYearThree, 22.03.2020
I live in an apartment and use the OX with headphones and it's an unbelievable tool for getting the most out of my tube amp at home. I also use it in recording setting without the speaker engaged to prevent microphone bleed and again it does not disappoint. Because of the OX I've gotten to become far more familiar with everything my amp, pedals, and guitars are capable of and I yet to experiment more with the different microphone and post effects available with the software. One drawback is that the cable that powers the OX is faulty and has the tendency to fall out because of a poor connection. Despite this, I would recommend this product to everyone. It's been a game-changer for me
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Game Changer
Turk, 12.05.2019
I didnt know my guitars and Amps sounded this good. The Ox amp box opens up all the sounds you have been listening to for years on all those hit records. It makes me want to record and play more everyday. Money well spent.
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Very Impressive
PeteW, 16.05.2018
I've been using Suhr reactive loads and Spear IR's for a while now but easy portability of sounds between studios led me to look at the OX. the quality of the simulations is superb as you would expect. I was initially worried that I might not be able to get "my 1265 cab sound" as currently you cannot add custom IR's. However, I quickly found a '65 preset and nailed the tone/cab I'm used to hearing. Room eq, Mic's etc are all excellent and the quality of effects - especially the reverbs are superb and very usable. Very little tweaking needed.

My only disappointment is the inability to connect to the Ox via an iPhone app (although manual implies this is possible) - It can only be done via iPad app. I always carry a phone with me, but would rather not carry a pad around especially live. Also I don't run El Capitan and the current software cannot support this. El Capitan is not that old so I'm disappointed by that decision. Overall software is pretty good on the iPad - fairly easy to navigate and call up/store presets etc

Overall - Superb unit - pricey but worth the outlay.
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A must have for valve amp lovers
Allthatjazz, 17.12.2019
The ox Box is sturdy and robust. The attenuator is easy to use but has a very slight volume drop even when not in use. Not to be compared with the Boss Enhanser because it does not use reamping. No IR simulations but a one of a kind modulation. My old 100 watt amp heads can be used at a non-deafening volume and recording becomes as easy as a walk in the park. To bad it had an external power adapter and software updates are rare.
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£1,159
Free shipping incl. VAT
Available immediately
Available immediately

This item is in stock and can be dispatched immediately.

Standard Delivery Times
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FAX: +49-9546-9223-24
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Offers include VAT and are valid as long as stocks last. We do not accept liability for typographical errors or inaccurate information of any kind. *RRP = manufacturer's / distributor's recommended retail price in Germany
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