Elite Audio Conversion and Four Unison Preamps on your Desktop.

Apollo x4 delivers elite-class A/D and D/A conversion, four Unison-enabled preamps, and QUAD Core realtime UAD plug-in processing — all in a sleek desktop Thunderbolt 3 audio interface for Mac and Windows.

Built upon Universal Audio's 60-year heritage of audio craftsmanship, Apollo x4 easily outshines everything in its class, with 127 dB D/A dynamic range and an included bundle of acclaimed UAD analog emulation plug-ins, giving you a fully-stocked analog studio, right on your desktop.

Four Unison Preamps: Get the Sound of Neve, Helios, API, Manley & More

Apollo x4 features four Unison-enabled mic preamps, letting you track through exacting mic preamp emulations from Neve, Helios, API, Manley, UA and many more. Unison technology nails the tone of these sought-after tube and solid state mic pres — including their input impedance, gain stage “sweet spots,” and the component-level circuit behaviors of the original hardware.

Based on Unison's proprietary hardware-software integration, Apollo x4 lets you record at near-zero latency through emulations like the included UA 610-B Tube Preamp & EQ, for authentic analog sound unmatched by other interfaces. Unison technology is also found on Apollo x4's two front-panel Hi-Z instrument inputs, providing dead-on impedance and gain matching for guitar and bass amp models from Fender, Marshall, Ampeg, and more. 

Elite-Class A/D and D/A Conversion 

With thousands of hit songs and hundreds of Grammy-winning albums under their belt, Apollo desktop interfaces are used to create exceptional-sounding records every day. To improve upon the previous generation, UA engineers designed the Apollo x4’s audio conversion to deliver a striking 127 dB dynamic range and and -117 dB THD+N, giving Apollo x4 a spacious, organic sound that easily rivals dedicated high-end converters costing much more.

Realtime UAD Processing — a Studio Full of Analog Sounds 

Building upon the Apollo tradition, Apollo x4 reveals a stunning range of classic analog tones and color via its Realtime UAD Processing. With powerful UAD-2 QUAD Core processing onboard, Apollo x4 lets you record through the full range of UAD Powered Plug-Ins — at near-zero latency — including authentic titles from Neve, Studer, Helios, API, Lexicon, Manley, Fender, Capitol Studios, and more.*

Right out of the box, the Apollo x4 includes the “Realtime Analog Classics Plus” suite of UAD plug-ins — the UA 610-B Tube Preamp & EQ, Teletronix LA-2A and 1176 compressors, Marshall^® Plexi Classic Guitar Amp, Ampeg^® SVT-VR Classic Bass Amp, Pultec EQs, and more — so you have a rack full of bonafide audio classics already onboard. 

Expanded I/O & Built-in Talkback Mic

In addition to its four Unison-equipped preamps, Apollo x4 offers two independent headphone outs and two Hi-Z instrument inputs — letting you collaborate easily. Plus, with a total of four line outs, optical ADAT/SPDIF input and output, dedicated monitor remote controls, and a built-in Talkback mic, the 12 x 18 Apollo x4 can serve as the powerful centerpiece of your professional desktop studio. 

Professional Performance and Scalability 

Users of Apollo x4 can combine up to four Thunderbolt Apollos and six total UAD-2 devices — adding I/O and DSP as your studio grows. Once you expand your studio with an Apollo X rackmount unit, you can use Apollo x4 as a desktop monitor control with additional I/O and DSP power.