Quick answer: The Apollo x4 Gen 2 STU is a Universal Audio Apollo audio interface with onboard DSP for realtime UAD plug-in processing while you record. Priced at $1999.00, sold brand-new by Victory Musical Instruments, a veteran-owned authorized UA dealer in Miami, FL. Questions? Call 844-687-4208.

The most powerful desktop Apollo, with UA's full Studio+ library. The Universal Audio Apollo x4 Gen 2 Studio+ Edition pairs the four-preamp x4 with over 50 UAD plug-ins — a complete tracking-and-mixing studio in a desktop footprint.

At a Glance

Overview

Apollo x4 Gen 2 is built for the producer or engineer who needs four simultaneous mic inputs — for tracking drums, small ensembles, or anyone who runs out of channels on a Twin X. Elite-class 24-bit / 192 kHz conversion, four Unison mic preamps, two Hi-Z instrument inputs, QUAD Core DSP, and 12 In / 18 Out total I/O make it the most capable desktop Apollo. The Studio+ Edition adds the deepest UAD plug-in bundle UA offers at this tier.

Key Features

• Elite-Class Apollo X Gen 2 Conversion — 24-bit / 192 kHz with up to 129 dB dynamic range, the widest of any desktop Apollo.
• Four Unison Mic Preamps — Authentic emulations of Neve, API, Manley, SSL, Avalon, Fender, and more, with circuit-level impedance modeling.
• QUAD Core DSP — Runs UAD plug-ins in realtime, independent of your computer's CPU.
• 12 In / 18 Out I/O — four Unison preamps, two Hi-Z instrument inputs, 2 monitor outs, four line outs (ALT 1/2), two TRS headphone outs, optical Toslink I/O
• Apollo Monitor Correction by Sonarworks® — Calibrate main monitors and headphones for accurate playback in any room (available add-on).
• Updated UAD Console — Auto-Gain, Plug-In Scenes, Bass Management, immersive audio support, integrated talkback, and Monitor Controller.
• Optical Toslink I/O — ADAT or S/PDIF for digital expansion.
• Thunderbolt 3 (USB-C) — Mac and Windows compatible.

Connectivity

• Analog Inputs — 4 x XLR-1/4" combo (rear) + 2 x 1/4" Hi-Z instrument inputs (front).
• Analog Outputs — 2 x 1/4" monitor outs + 4 x 1/4" line outs (configurable as ALT 1 / 2).
• Headphones — 2 x 1/4" TRS with independent volume.
• Digital — Optical Toslink for ADAT (up to 8 channels at 44.1/48 kHz) or S/PDIF I/O.
• Computer — Thunderbolt 3 (USB-C).
• Power — External power supply (included).

Studio+ Plug-In Bundle

The expanded UAD plug-in library for serious recording and mixing — over 50 titles:

• Channel Strips & Preamps — Avalon VT-737sp, Manley Reference Microphone Preamp, V76 Preamplifier, Century Tube, Helios Type 69, UA 610-A and 610-B, Precision Channel Strip, CS-1.
• Compressors — dbx 160, Empirical Labs Distressor, Fairchild 660 and 670, Teletronix LA-2A (all four versions) and LA-3A, UA 1176 Rev A / AE / Rev E / LN / SE, UA 175B and 176.
• EQs — Helios Type 69, complete Pultec collection (EQP-1A, HLF-3C, MEQ-5, EQP-1A Passive, Pultec Pro).
• Special Processing — Auto-Tune Realtime Access / Advanced / X, Oxide Tape Recorder, Studer A800 Multichannel Tape, Precision Enhancer Hz, Vibe Analog Machines Essentials.
• Instruments — Electra 88, Moog Minimoog, Opal Morphing Synth, PolyMAX, Ravel Grand Piano, Waterfall B3 Organ.
• Effects — Lexicon 224 Digital Reverb, Brigade Chorus, Galaxy Tape Echo, Studio D Chorus, Waterfall Rotary, Pure Plate Reverb, Ampeg SVT-VR, Marshall Plexi, Raw Distortion.

Built for Larger Sessions

Where the Twin X handles vocals, guitars, and overdubs, the Apollo x4 handles entire bands. Four simultaneous Unison preamp inputs are enough to track a singer-songwriter with full guitar/bass/vocal rig, a small ensemble, or a basic drum kit — and the ALT 1 / 2 monitor switching and dual independent headphone outputs make it studio-ready for tracking with a collaborator or engineer.

What's in the Box

• Apollo x4 Gen 2 audio interface
• External power supply
• Thunderbolt 3 cable (USB-C)
• Studio+ UAD plug-in bundle (digital via UA Connect)

Frequently Asked Questions

Does this Apollo work on Windows, Mac, or both?

This Thunderbolt Apollo works on both Mac and Windows computers that have a Thunderbolt 3 or 4 port.

Can I run UAD plug-ins in realtime while tracking?

Yes. Apollo's onboard DSP runs UAD plug-ins at near-zero latency, so you can print or monitor through analog emulations of classic preamps, compressors, EQs, and amps as you record.

What plug-ins are included with the Studio edition?

The Studio edition includes a UAD plug-in bundle selected by Universal Audio covering compressors, EQs, reverbs, tape, and preamps. Higher tiers include more titles; current contents are published by UA.

What's included in the box?

Your purchase includes: Apollo x4 Gen 2 audio interface, External power supply, Thunderbolt 3 cable (USB-C), Studio+ UAD plug-in bundle (digital via UA Connect).

Is the Apollo x4 Gen 2 STU a genuine Universal Audio product?

Yes. Victory Musical Instruments is a veteran-owned, authorized Universal Audio dealer based in Miami, FL. Every unit is brand-new, factory-sealed, and covered by the full UA manufacturer warranty.

Can I get help choosing or setting it up?

Absolutely. You'll talk to real people, not a call center. Call us at 844-687-4208 and we'll help you spec the right gear and get it running.

Why Buy from Victory Musical Instruments

Victory Musical Instruments is a veteran-owned authorized retailer in Miami, FL. Whether you're outfitting a home studio, a college program, or a worship room, we'll help you spec the right gear and stand behind the sale. Save through our ID.me military discount program — active duty, veterans, reservists, and eligible family.