Get Legendary Studio Tones from Your Tube Amp Anywhere at Any Volume with the Universal Audio OX Amp-Top Box

OX is a premium reactive load box and guitar recording system, providing you with perfectly studio-miked amp sounds from your favorite tube amp. OX lets you play and record your amp in its sweet spots - from huge clean tones and edge-of-breakup to fully cranked - at any volume level, and with mic, room, and speaker cabinet emulations at the turn of a knob.

Featuring Universal Audio's breakthrough Dynamic Speaker Modeling, OX is the first system to accurately emulate speaker drive, breakup, and cone cry, making it the world’s finest speaker attenuator and guitar amp recording solution.

• Play and record your tube amp in its tonal sweet spot - anywhere, at any volume, with full dynamics
• Audition, tweak, and save more than 100 jaw-dropping custom Rigs from compatible iPad, or Mac/Windows computers
• Get stunning mic and guitar cabinet combinations at the turn of a RIG knob - no miking required
• Get authentic "edge of destruction" sounds, complete with UA Dynamic Room Modeling, speaker breakup, and cone cry

The World's Best Reactive Load Box

With decades of analog hardware engineering expertise, Universal Audio’s dream team of engineers set out to design a reactive load box that retains the tone, dynamics, and feel of your tube amp - no matter how much it's attenuated. The goal was for your tube amp to "see" OX as an actual speaker - with continuously variable impedance and response - so you don't lose a drop of tone or playing dynamics.

A Complete Guitar Recording System

OX's front-panel, six-position RIG control allows you to quickly choose from complete setups - including emulated speaker cabinets, close mics, ambient room mics, and up to four simultaneous studio effects. OX is also the only guitar recording system to offer a complete selection of expertly placed room mics, giving you the authentic experience of pushing air while recording your cranked amp in a world-class tracking room.

Dynamic Speaker Modeling

UA's groundbreaking Dynamic Speaker Modeling faithfully emulates speaker breakup, drive, and cone cry - an essential ingredient to authentic tube amp tones. Using the Speaker Breakup knob in the OX app, you can control the harmonics and sonic complexity that occurs only at certain frequencies and volume levels on various speakers - far beyond a static Impulse Response system - giving you the same sonic phenomenon that occurs with a real speaker cabinet.

All The Right Connections

Not only does OX Amp Top Box feature a front-panel headphone jack for silent practice with your cranked tube amp, it also sports a bevy of connections for all kinds of recording and live workflows. Stereo S/PDIF digital outputs via RCA and optical TOSLINK, as well as balanced TRS stereo line outputs with front panel level control, give you the necessary connections for studio monitors, DAW, or live mixing console inputs. Plus, you can connect any one, two, or three-button footswitch and toggle OX's studio-quality effects on and off.

A Beautiful Software App

Most guitar products do digital awkwardly. They're ugly and hard to understand. The OX software app, on the other hand, offers slick, intuitive control over all of OX's RIG settings via Wi-Fi - letting you tweak, store and recall hundreds of presets from your iPad, Mac, or Windows 10 computer. You can then save your six favorite tones onto OX's front-panel RIG knob for instant recall in the studio or at a gig.

Manufacturer: Universal Audio
Model: OX
SKU: I495647-GA999251115-1-WHXX
UPC: 819937002397

We are Chuck Levin's Washington Music Center

Since 1958, Chuck Levin’s Washington Music Center has been the trusted destination for musicians and audio professionals across Maryland, Virginia, and Washington, D.C. Family-owned and operated, our legendary music store delivers Everything in Music®—from instruments and recording gear to pro audio, rentals, and repair services.

Our team of musicians and industry experts lives and breathes gear, helping you build the perfect setup for your next performance, studio session, or installation. As an authorized dealer for top brands, we also offer our award-winning CHUCKSCLUSIVE line—exclusive, limited-edition instruments and collaborations recognized with the NAMM Top 100 Dealer Innovation Award for redefining what a music retail experience can be.

Chuck Levin’s isn’t just a store—it’s a community built by players, engineers, and creators who share a lifelong passion for sound. Stop by our legendary Wheaton, MD showroom or contact us anytime for expert advice, product questions, or the best possible deal on your next piece of gear.