Presenting the new Universal Audio OX Stomp Dynamic Speaker Emulator.

Standing on the shoulders of UA's award-winning OX Amp Top Box, OX Stomp Dynamic Speaker Emulator pedal gives "amp-in-a-box" modelers a packed pro studio full of authentic-sounding guitar cabinets, mics, room modeling, and studio-quality effects — right at your feet. Going far beyond the one-dimensional captures of Impulse Response systems, only UA’s groundbreaking Dynamic Speaker Modeling convincingly emulates speaker breakup, drive, and cone cry — providing harmonics and sonic complexity indistinguishable from a perfectly studio-miked speaker cabinet.

Experience Award-winning Room Emulation

In addition to expertly placed close condenser, dynamic, and ribbon mics on your cabs, OX Stomp is the only effects pedal to offer a complete selection of room mics with Dynamic Room Modeling. This gives you the authentic experience of pushing air while recording your cranked amp in a world-class tracking room.

Enjoy Studio-Quality Effects

Beyond mic and speaker cabinet modeling, OX Stomp also lets you craft stunning guitar sounds with UA effects like genuine 1176 compression, plate reverb, chorus, flange, three delay types, and four-band EQ with high and low-cut filters.

Expand the Tones of any Amp-in-a-Box Modeler

Whether you're using a UAFX amp emulator pedal or other popular amp modelers, multi-effects, or profilers — even your favorite amp's preamp line out — OX Stomp gives you over 100 curated RIG setups, giving you inspiring sounds for any amp type or genre, right out of the box.*

Customize your OX Stomp with a Full-Featured Mobile App

With the UAFX Control app, you can easily swap cabs and mics, fine-tune effects, assign RIG presets, and configure footswitches to instantly toggle sounds and/or effects, for a pro studio's worth of tones on your pedalboard.

*Note that OX Stomp is designed for instrument and line level only — it's not a speaker load or power attenuator. OX Stomp Dynamic Speaker Emulator requires a modern 400 mA isolated power supply (sold separately).  for power supply recommendations.

• The most authentic sounding speaker, cab, mic, and room tones ever emulated in a stompbox
• Authentic speaker modeling including speaker breakup, drive, and cone cry
• Over 100 curated RIGs perfect for any amp emulator or genre for endless inspiration
• Studio-quality effects including genuine UA 1176 compression, plate reverb, EQ, and stereo delay (dual, crossover, ping-pong) for perfectly produced tones
• UAFX Control app for fine-tuning mics, effects, and footswitch configurations
• Silent switching, buffered bypass, analog dry through

Power requirements (power supply sold separately): Isolated 9VDC, center-negative, 400mA minimum
Inputs: 2 x ¼" unbalanced TS (input 2 for stereo connections)
Outputs: 2 x ¼" unbalanced TS (output 2 for stereo connections)
Bypass modes: (switchable within UAFX Control app) Buffered bypass
Input impedance: 500 Kilohms (Mono In) 1 Megohms (Stereo In)
Output impedance: 500 Ohms
Maximum input level: 12.2 dBu
Maximum output level: 12.1 dBu
Frequency response: 20 Hz to 20 kHz, ±1 dB
USB Type-C : For registration and firmware updates via computer
Wireless technology: Bluetooth v5
Transmitted Frequency Range: 2.400 GHz – 2.4835 GHz
Maximum Output Power: +4.35 dBm
Dimensions (with knobs and protrusions)
Height: 2.56 inches, 6.5 cm
Width: 3.62 inches, 9.2 cm
Depth: 5.55 inches, 14.1 cm
Weight (unboxed): 1.3 lbs 0.588 kg