Universal Audio Apollo x4 Gen 2 STU+ Desktop Audio Interface

Produce larger sessions with our most powerful desktop Apollo. Featuring highest-resolution audio conversion, four Unison™ mic preamps, and realtime UAD processing — letting you record through plug-ins from Neve, API, Manley, and hundreds more — Apollo x4 levels up your studio with legendary UA sound, built to inspire your next collaboration.

We built Apollo x4 to expand on the gold-standard Apollo Twin, the audio interface that single-handedly revolutionized home studio recording. With expanded I/O, elite-class 24-bit / 192 kHz audio conversion, and the widest dynamic range to date, Apollo x4 puts the sound of the stars in reach.

With four Unison™ preamps and dual front panel Hi‑Z instrument inputs, Apollo x4 lets you track through emulations of classic gear from Neve, Manley, API, Fender, and dozens more, giving you the rich analog textures used on the greatest recordings of our time.

Right out of the box, Apollo x4 gives you the plug-ins used by the world’s best engineers. Get legendary Teletronix LA-2A and 1176 compressors, UA 610, Century, and LA-6176 tube channel strips, plus UAD guitar amps like Showtime ’64 and Lion ’68. Choose from a selection of upgrade bundles to tap into the entire UAD library of over 200 titles to unlock proven hit-making sounds.

Now in its Gen 2 design, Apollo x4 features our highest-resolution D/A converters ever. This enhanced monitoring, paired with features like Apollo Monitor Correction by Sonarworks,* means you’ll hear the most accurate representation of your recordings when mixing through monitors or headphones. *Requires SoundID Reference software and compatible measurement microphone. Learn more at sonarworks.com.

Just like many pro studios, where an analog console is the heart of the workflow, Apollo x4 has a powerful mixing engine where you control plug-in routing and monitoring. And with the latest features like Auto-Gain, Bass Management, and Plug-In Scenes, it’s easy to find a flow that fits your needs.

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

Build out your dream studio by linking up to four Thunderbolt Apollo interfaces for up to 128 channels of premium I/O, and control it all from your desktop using Apollo x4. So no matter how far your music takes you, an Apollo will always be in reach.**