Quick answer: The OX Stomp Dynamic Speaker Emulator is an authentic Universal Audio UAFX product. Priced at $399.00, sold brand-new by Victory Musical Instruments, a veteran-owned authorized UA dealer in Miami, FL. Questions? Call 844-687-4208.

Get perfectly miked guitar tones in seconds. The Universal Audio UAFX OX Stomp Dynamic Speaker Emulator brings UA's award-winning Dynamic Speaker Modeling — derived from the OX Amp Top Box — to your pedalboard, giving any amp modeler, preamp, or amp line-out a studio-quality cabinet, mic, and room emulation in a single stereo pedal.

At a Glance

Overview

Most cabinet simulators are static — they capture one moment of one speaker's response (an impulse response) and apply it to your signal. OX Stomp goes far beyond IR loading with UA's Dynamic Speaker Modeling, which captures speaker breakup, drive, cone cry, and dynamic harmonic response — the things that make a real miked cab sound alive. Pair it with a UAFX amp pedal (with cab emulation bypassed), any third-party amp modeler, a real amp's line out, or even a preamp section, and OX Stomp delivers album-ready tone instantly.

Key Features

• UA Dynamic Speaker Modeling — Captures speaker breakup, drive, cone cry, and dynamic response — far beyond static IR loading.
• 22 Speaker Cabinets — From classic American 1x12 combos to British 4x12 stacks to boutique designs.
• 6 Vintage Studio Microphones — Close-mic condensers, dynamics, and ribbons; expertly placed for each cabinet.
• Dynamic Room Modeling — The only effects pedal with complete room mic modeling, capturing the air and reflections of world-class tracking rooms.
• 100+ Curated Factory Rigs — Each Rig combines speaker cab + dual mics + room sound + effects in one preset.
• Onboard Studio-Quality Effects — Genuine UA 1176 compression, plate reverb, modulation (chorus/flange), three delay types (dual/crossover/ping-pong), and 4-band EQ with high and low-cut filters.
• Stereo Operation — Two-channel inputs and outputs for stereo cab routing and ping-pong effects.
• MIDI-over-USB — Realtime MIDI control of effects and presets.

UAFX 2.0 Features

• Four On-Pedal Presets — Store and recall four complete amp settings via the footswitches; instantly switch between rhythm, lead, clean, and dirty tones.
• MIDI-over-USB — Realtime MIDI control of parameters and preset changes for programmable rigs.
• Improved Bluetooth + USB-to-Mobile — Reliable wireless or hardwired connection to the UAFX Control mobile app.
• UAFX Control App — Audition cabs, mics, rooms, presets, and artist signature sounds; archive your favorites to the cloud.

Specifications

• Power — Isolated 9V DC, center-negative, 400 mA minimum (sold separately).
• Inputs — 2 x 1/4" TS (right input for stereo connections and 4-cable mode).
• Outputs — 2 x 1/4" TS (right output for stereo connections and 4-cable mode).
• USB — USB Type-C for firmware updates and MIDI-over-USB.
• Wireless — Bluetooth for UAFX Control mobile app connection.
• Dimensions — 2.56" x 3.62" x 5.55" (65 x 92 x 141 mm).
• Weight — 1.3 lbs.

OX Stomp vs. OX Amp Top Box

OX Amp Top Box is a reactive load box, attenuator, AND speaker emulator — designed to take the speaker output from a tube amp head and convert it to line-level signal while also providing cab/mic emulation. OX Stomp is the cab/mic/room emulation portion only, in a pedal form factor, designed for instrument and line-level signals. OX Stomp is NOT a load box — do not connect amp speaker outputs to it. Use OX Stomp with UAFX amp pedals (cab bypassed), other modelers, or amp preamp line outs.

Use Cases

• UAFX Amp Pedal Companion — Bypass the UAFX amp pedal's built-in cab and use OX Stomp's 22 cabs instead for more variety.
• Third-Party Modeler Cab — Replace the cab section of a Kemper, Helix, or other modeler with UA Dynamic Speaker Modeling.
• Direct to Interface or PA — Plug any modeler/preamp into OX Stomp and go direct, with album-ready cab tone.
• Real Amp Line Out — Use the line-level output of your real amp (preamp section) through OX Stomp for silent recording.

What's in the Box

• UAFX OX Stomp Dynamic Speaker Emulator pedal
• Quick start guide
• Note: 9V isolated power supply (minimum 400 mA) sold separately

Frequently Asked Questions

What power supply does this UAFX pedal need?

It runs on a standard 9V DC center-negative power supply (larger UAFX models need a higher-current supply). Check the box contents listed above to see whether a power supply is included with this model.

Is it true bypass, and does it work in stereo?

UAFX pedals offer switchable true or buffered bypass via the free UAFX Control app, and stereo-capable models accept and output stereo through their TRS or dual jacks.

Do I need the UAFX Control app to use it?

No, the pedal works standalone right out of the box. The free UAFX Control app (mobile and desktop) is optional and unlocks extra presets, alternate models, and deeper settings.

What's included in the box?

Your purchase includes: UAFX OX Stomp Dynamic Speaker Emulator pedal, Quick start guide.

Is the OX Stomp Dynamic Speaker Emulator a genuine Universal Audio product?

Yes. Victory Musical Instruments is a veteran-owned, authorized Universal Audio dealer based in Miami, FL. Every unit is brand-new, factory-sealed, and covered by the full UA manufacturer warranty.

Can I get help choosing or setting it up?

Absolutely. You'll talk to real people, not a call center. Call us at 844-687-4208 and we'll help you spec the right gear and get it running.

Why Buy from Victory Musical Instruments

Victory Musical Instruments is a veteran-owned authorized UA dealer based in Miami, FL. We back every sale with real human support, fast shipping, and the kind of follow-through that only comes from a small dedicated team. Active duty, veterans, reservists, and eligible family save through our ID.me military discount program.