UA Apollo x4 Gen 2 STU • Desktop/TB3/MAC/WIN

• 18 x 20 Thunderbolt audio interface with HEXA Core DSP plug-in processing
• Two DB-25 inputs (line 1-16), stereo AES I/O (XLR), word clock I/O (BNC)
• Two monitor outs (XLR), two DB-25 outputs (line 1-16 or ALT / 9.1.6 surround)
• Elite-class Apollo X Gen 2 converters with 24-bit / 192 kHz resolution featuring Dual-Crystal Clocking for ultra-low jitter at all sample rates

Create with the World’s Most Powerful Desktop Audio Interface

Record and mix larger sessions and hear every detail with the next generation of UA’s Apollo x4 interfaces, featuring highest-resolution audio conversion, four Unison™ mic preamps, and QUAD Core DSP processing. This allows you to record in real-time through UAD plug-ins from Neve, Manley, Avalon, SSL, and hundreds more.

Trusted by top artists and producers, Apollo x4 levels up your productions with timeless sound and legendary UA craftsmanship, built to inspire your next collaboration.

Key Benefits

• Hear next generation audio conversion with the widest dynamic range and lowest distortion of any Apollo
• Experience analog tones with Unison™ preamps, recording in real-time through authentic emulations of Neve, API, Avalon, Manley, Fender, and more
• Access the full library of 200+ UAD DSP and Native plug-ins, including award-winning titles like Capitol Chambers, Sound City Studios, EL8 Distressor, and more
• Mix with confidence in any room or through headphones using Apollo Monitor Correction powered by Sonarworks®*
• Use Auto-Gain to set your levels across multiple inputs in seconds and never miss the take
• Hear all the low-end detail in your mixes using bass management to add a subwoofer to your monitor setup
• Quickly set up low-latency cues, plug-in scenes, and immersive audio monitoring with the UAD Console app
• Get thousands of dollars in award-winning UAD plug-in titles from Auto-Tune, Fairchild, Teletronix, and more with a choice of Essentials+ or Studio+ Editions

Get the Most Powerful Desktop Apollo Ever

Universal Audio built Apollo x4 to expand on the gold-standard Apollo Twin, the interface that revolutionized home and project studio recording. With expanded I/O count, unprecedented dynamic range, and elite-class 24-bit / 192 kHz audio conversion, Apollo x4 puts the sound of the stars in reach for project studios and collaborators.

Record Through Iconic Preamps

Apollo x4’s four Unison™ preamps and dual front panel Hi‑Z instrument inputs let you track in real-time through preamp and channel strip plug-ins from Neve, Manley, API, and more, giving you rich analog textures used on the greatest recordings of our time.

Mix with Authentic Analog Sounds

Apollo x4 provides the tools used in the world’s biggest recording studios right out of the box. With included Teletronix LA-2A compressors, Pultec EQs, and amps from Marshall and Ampeg, you can tap into over 200 UAD plug-ins, including hit-making sounds like Ocean Way Studios and Capitol Chambers.

Hear the Details Like Never Before

Now in its Gen 2 design, Apollo x4 features UA’s highest-resolution D/A converters ever, paired with Apollo Monitor Correction powered by Sonarworks®. Whether listening through monitors or headphones, you’ll hear the most pristine representation of your recordings, with no surprises when you listen to your final mix or master.

Find Your Flow in the UAD Console App

Apollo x4’s digital mixing engine lets you control plug-in routing and monitoring just like an analog studio console. With features like Auto-Gain, Bass Management, and Plug-In Scenes, it’s easy to find a workflow that fits your needs.

A Hybrid System, Made for Your Mission

Combine Apollo x4’s QUAD Core DSP with native processing from your computer to produce large sessions with complex plug-in chains, offering a hybrid workflow that outpaces any native-only recording setup.

Expand Your Studio as You Grow

Link up to four Thunderbolt Apollo interfaces for up to 128 channels of premium I/O and control everything from your desktop using Apollo x4. No matter how far your music takes you, an Apollo will always be within reach.**

Key Features

• 12 x 18 Thunderbolt audio interface with QUAD Core DSP plug-in processing
• Four Unison™ mic preamps, two Hi-Z instrument inputs, optical Toslink I/O (ADAT or S/PDIF)
• Two 1/4 monitor outs, four 1/4 line outs (ALT 1 / 2), two 1/4 TRS headphone outs
• Elite-class Apollo X Gen 2 converters with 24-bit / 192 kHz resolution
• Enhanced D/A for critical monitoring and playback with 129 dB dynamic range
• Calibrate your main monitor and headphone outputs with Apollo Monitor Correction powered by Sonarworks®*
• Fully-featured monitor controller with alternate speaker switching and integrated talkback for easy communication with talent
• Updated UAD Console app featuring Auto-Gain, Plug-In Scenes, subwoofer integration with Bass Management, immersive audio support, and more
• Onboard DSP supports over 200 UAD plug-ins via VST, AU, and AAX 64 formats in all major DAWs
• Includes up to 50+ UAD plug-ins with Essentials+ or Studio+ Editions
• Compatible with LUNA, Logic Pro, Pro Tools, Cubase, Ableton Live, and more**
• Expandable with Thunderbolt Apollo interfaces or select models over Dante
• Free industry-leading technical support from knowledgeable audio engineers

*Requires Apollo Monitor Correction Add-on and SoundID Reference licenses, available from sonarworks.com