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Universal Audio UAFX OX Stomp Dynamic Speaker

4.2 out of 5 stars from 32 customer ratings
UAFX Promo Q1/2026

UAD Guitar Amp Bundle free of charge

During the period from 01.02. to 31.03.2026 all buyers of one of the participatingUniversal Audio UAFX pedals will receive, after they register, theUAD Guitar Amp Bundle as a free download.

Effect Pedal for Electric Guitar

  • Stereo guitar pedal with Dynamic Speaker Modeling with 22 speaker cabinets, six vintage microphones and full-featured effects such as 1176 compression, plate reverb, chorus, flange, stereo delay (dual, crossover, ping-pong) and 4-band EQ with high and low cut filters via the UAFX Control App
  • Authentic speaker modelling, including speaker breakup, drive and cone cry
  • UAFX Control app for fine-tuning microphones, effects and footswitch configurations
  • Silent switching
  • Buffered Bypass
  • Analogue dry through
  • Bluetooth
  • Power supply via 9 V DC power supply unit (not included, suitable power supply unit: art. 543322)
  • 2 Line/instrument inputs: 6.3 mm jack mono (L/R stereo)
  • 2 Line outputs: 6.3 mm jack mono (L/R stereo)
  • USB Type-C for updates via computer
  • Dimensions: 9.2 x 6.5 x 14.1 cm
  • Weight: 0.588 kg
  • Available since October 2023
  • Item number 576137
  • Sales Unit 1 piece(s)
  • Effect Types Speaker Simulation
B-Stock available from 322 €
349 €
All prices incl. VAT
In stock
1

Pedal-sized cab simulation

The Universal Audio UAFX OX Stomp Dynamic Speaker brings the proven speaker simulation of the OX Amp Top Box into a compact pedal format, without integrated load resistance. Multiple speaker types are available, each captured with two virtual microphones, adjustable room ambience, and optional effects for detailed tonal shaping. The OX Stomp makes pedalboards, preamps, and modelling amps sound convincingly full, whether used live for sound reinforcement or in the studio. Stereo inputs and outputs, two onboard presets, and extended configuration via Bluetooth and the free UAFX Control app round off this flexible and professional solution.

Universal Audio UAFX OX Stomp Dynamic Speaker floor effect

Dynamic and versatile

The Universal Audio OX Stomp Dynamic Speaker relies on dynamic speaker simulations rather than static impulse responses, offering 22 speaker types ranging from 1x10" to 4x12" along with six microphone options for each configuration. Speaker distortion, room ambience, tone shaping, and dynamic processing can all be added to fine-tune the sound and create a more realistic playing experience. Six preconfigured rigs are accessible directly from the pedal, with quick control over dual mic levels, microphone selection, speaker saturation, room sound, and overall output level. Two footswitches allow easy switching between presets, while the UAFX Control app unlocks deeper parameter access and comprehensive rig management.

Rear panel of the Universal Audio UAFX OX Stomp Dynamic Speaker with connectors

Plenty of speakers, microphones and much more

The Universal Audio OX Stomp Dynamic Speaker is aimed at players seeking a highly versatile speaker simulation without load resistance, offering extensive sound shaping through 22 speaker types ranging from Jensen to Celestion, from open to closed designs, and from small to large cabinets. Each microphone channel provides a choice of Shure SM57, Neumann U67, Royer Labs 121, Sennheiser MD 421, AKG C414, Beyerdynamic M160, or a direct signal, all of which can be shaped, balanced, and positioned in the stereo field using dedicated equalisers. Room ambience can also be finely adjusted through microphone selection and EQ, after which the signal passes through an additional equaliser, an emulation of the 1176 compressor, plus delay and plate reverb effects. The finished sound is saved as a rig, accessible via the pedal’s footswitches and stored across six available rig slots.

Universal Audio UAFX OX Stomp Dynamic Speaker footswitch

About Universal Audio

Few manufacturers can draw upon a wealth of audio engineering experience comparable to that of Universal Audio. The company's founding father Bill Putnam, along with his friend Les Paul, have an admirable reputation as trend-setting music producers and developers of legendary analogue studio technology. Putnam recorded Chuck Berry, Muddy Waters, and Sarah Vaughan, and was Duke Ellington's favourite sound engineer. He developed the famous 1176 Peak Limiter and distributed the Teletronix LA-2A level amplifier. This earned him a posthumous "Technical Grammy Award" in 2000. In 1999, Putnam's sons, Bill Putnam Jr. and James Putnam, re-founded Universal Audio, transferring their father's analogue vision and craftsmanship to the digital music world. Their product range includes audio interfaces, dedicated DSP farms, and a variety of plug-ins, as well as analogue hardware devices.

Perfect for the pedal board and recording

Whether placed on a pedalboard, behind a preamp or modeller, or connected to the direct output of an amplifier, the Universal Audio UAFX OX Stomp Dynamic Speaker delivers a flexible and reliable solution with consistently high sound quality. Musicians can recall multiple rigs in both live and studio situations, making it easy to give their sound a different character on the fly. Variable room ambience, 1176 compression, several EQ stages, delay and modulation effects, and plate reverb provide extensive tools for refining the final sound and delivering it in stereo. The OX Stomp's configurable footswitches allow artists to switch instantly between complete setups or activate individual effects, while the app enables quick and convenient reconfiguration at any time.

In the spotlight

32 Customer ratings

4.2 / 5

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features

sound

quality

26 Reviews

Z
Bluetooth connection is painful, sounds are great
ZeeKay 03.12.2023
The amp and mic combinations are great sounding, controls are intuitive. The OX Stomp App works well, user experience is OK. The onboard effects are nice but an overkill for anyone owning a proper recording software with effect plugins or outboard effects. The only real drawback is the units Bluetooth connectivity that disconnects if your phone’s screensaver is on. So either you disengage your phone’s or iPad’s screensaver or you reconnect the device every time. Even a 10-year old car’s Bluetooth connectivity is more user friendly . I am hopeful UAD listens to customer complaints and fixes this issue asap.
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5
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Z
Excellent sound, horrible interaction
Zettemusik 23.10.2023
The sound of this little box is great and it is super tweakable. You get the bonus of a compressor, a delay and a plate reverb in one pedal. Now, the app does not live up to the expectations and bluetooth connectivity is unstable (if you get to connect). In pedals such as Dream or others, the app is not that necessary. In this pedal, many functions and tweaks need tha app. Please UA fix the bluetooth issue. Also, provide a PC/Mac app as you do with the big brother ox box.
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17
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R
Frustrating Control App
Raggytramline 10.09.2024
I spent four days trying to persuade the Ox Stomp to pair via Bluetooth to the app but without success so I'm returning it.Life is just to short for this. Clearly UAFX have to rethink relying on Bluetooth and instead write the Control App for desktops use via the USB port.
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7
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O
Best amp sim there is
Oujee 27.11.2025
Simple the best. I have paired this now regularly with my quad cortex and I think I can't go anymore back to simple IRs. The UA speaker simulation is so much better than simple IR model that this really boosts and existing setup there is. Also perfect pair with distortion pedals if you miss cab simulation.
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