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Universal Audio Apollo x4 Gen 2 Thunderbolt 3 Audio Interface with Essentials+ Bundle

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Universal Audio Apollo x4 Gen 2 Thunderbolt 3 Audio Interface with Essentials+ Bundle
90-Second Intro
Key Features
  • Musicians, Producers & Project Studios
  • 30+ UAD Plug-Ins, Real-Time Processing
  • External Power Supply, Mac/Windows
  • 4 Unison Mic/Line Pre, 2 Hi-Z In
Ideal for musicians, producers, and engineers working in project studios, the Universal Audio Apollo x4 Gen 2 with Essentials+ Bundle is a 12x18 desktop Thunderbolt 3 audio interface that offers four Unison mic/line preamps with Auto-Gain, flagship, Gen 2 Elite-Class 24-bit / 192 kHz AD/DA conversion, and QUAD Core DSP for real-time UAD plug-in processing over Thunderbolt at near-zero latency—on Mac and Windows computers. The Essentials+ Bundle lets you mix and record live performances with 36 UAD plug-ins including Pultec EQ, Auto-Tune, classic LA-2A and 1176 compressors, and more. You can use Plug-In Scenes to recall settings instantly, even in the middle of a performance.
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$1,699.00

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Universal Audio x4 Gen 2 Overview

Desktop QUAD Core Real-Time UAD DSP for Musicians, Producers, Project Studios
Ideal for musicians, producers, and engineers working in project studios, the Universal Audio Apollo x4 Gen 2 with Essentials+ Bundle is a 12x18 desktop Thunderbolt 3 audio interface that offers four Unison mic/line preamps with Auto-Gain, flagship, Gen 2 Elite-Class 24-bit / 192 kHz AD/DA conversion, and QUAD Core DSP for real-time UAD plug-in processing over Thunderbolt at near-zero latency—on Mac and Windows computers. The Essentials+ Bundle lets you mix and record live performances with 36 UAD plug-ins including Pultec EQ, Auto-Tune, classic LA-2A and 1176 compressors, and more. You can use Plug-In Scenes to recall settings instantly, even in the middle of a performance.

Easily connect the Apollo x4 Gen 2 to professional studio gear with 4x4 analog line-level I/O, two Hi-Z instrument inputs, and two monitor outputs via 1/4" connections.  An optical ADAT or S/PDIF I/O is also available for connection to professional, digital outboard hardware. You can mix with confidence in any room using Apollo Monitor Correction powered by Sonarworks. 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 with the UAD Console app.

What's New with Gen 2?
  • New look and feel, updated industrial design with new knobs and switch caps
  • Improved Elite-Class Gen 2 D/A converters 
  • Improved monitor and headphone outputs for best-in-class, critical listening
  • Even lower THD and increased dynamic range
  • Assistive Auto-Gain supporting one-click configuration across all input channels with select Unison preamps, for effortless recording
  • Built-in Room Correction enabling Sonarworks SoundID profiles to run on built-in DSP
  • Bass Management for subwoofers in Stereo configurations
  • New UAD Console brings AutoGain, Unison, Apollo Room Correction, DSP Pairing, Bass Management, Plug-In Scenes over MIDI, and more—together under one roof
  • New Essentials+ and Studio+ software bundles with UAD plug-ins and Instruments
Record Through Four Unison Preamps
  • With Unison technology, Apollo x4 Gen 2 lets you track in real time with the sound of classic EQs and compressors.
  • From Neve, API, Manley, Fender, and more, you get the same rich analog textures used on the greatest recordings of our time.
Hear the Details Like Never Before
  • Apollo x4 features UA's high-resolution A/D and D/A converters, delivering 129 dB of dynamic range.
  • This enhanced monitoring, when paired with the newest features like Apollo Monitor Correction by Sonarworks, means you'll hear the most accurate representation of your recordings when mixing through monitors or headphones. And there will be no surprises when you listen to your final mix or master on any stereo system.
Auto-Gain: Never Miss the Take
  • Set input gain across multiple channels in seconds without fear of clipping using the new Auto-Gain feature—available on all microphone / line / Hi-Z preamp inputs.
  • Effortlessly set gain for recording during an auto-training time listening window, without having to worry or take a lot of time to find the perfect recording level.
Bass Management
  • Add a subwoofer with the new bass management feature for full-range stereo monitoring.
  • Speaker utilities panel provides trim, mute and solo per speaker output.
Apollo Room Correction
  • Room Correction runs on a single SHARC DSP core, with UA’s studio-grade, low-latency EQ algorithms, using over 20 precision filters and up to 100 ms of loudspeaker time alignment to transform your monitoring accuracy.
  • Create SoundID Reference measurements for Apollo Room Correction directly within the SoundID Reference Measure desktop application.
Find Your Flow in the UAD Console App
  • Just like an analog studio, where a console is the heart of the workflow, Apollo x4 has a powerful digital mixing engine, where you control plug-in routing and monitoring.
  • With the latest features like Bass Management and Plug-In Scenes, it’s easy to find a flow that fits your needs.
A Hybrid System, Made for Your Mission
  • Combine Apollo x4’s QUAD Core DSP with native processing from your host computer.
  • Produce large sessions with complex plug-in chains—a powerhouse hybrid workflow that outpaces any native-only recording setup.
Expand Your Studio as You Grow
  • Build your studio by linking up to four Thunderbolt Apollo interfaces with up to 128 channels of premium I/O.
  • Control it all from your desktop using Apollo x4.
Key Features
  • 12x18 Thunderbolt audio interface with QUAD Core DSP real-time plug-in processing
  • Includes up to 30+ UAD plug-ins with Essentials+ Edition
  • 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 featuring dual-crystal clocking for ultralow jitter at all sample rates
  • 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
  • Full-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
  • 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
36 Effects and Instruments, One Rack Space
Channel Strips and Preamps (6)
  • Century Tube Channel Strip
  • CS-1 Channel Strip 
  • Helios Type 69 Preamp and EQ 
  • Precision Channel Strip
  • UA 610-A Preamp and EQ
  • UA 610-B Preamp and EQ
Compressors/Limiters (7)
  • Fairchild 670 Legacy
  • Teletronix LA-2A Classic Leveler
  • Teletronix LA-2A Gray Classic Leveler
  • Teletronix LA-2A Silver Classic Leveler
  • Teletronix LA-2A Legacy Leveling Amplifier
  • UA 1176LN Legacy 
  • UA 1176SE Legacy
Equalizers (6)
  • Helios Type 69 Legacy EQ
  • Pultec EQP-1A Legacy EQ
  • Pultec EQP-1A Passive EQ
  • Pultec HLF-3C Passive EQ
  • Pultec MEQ-5 Passive EQ
  • Pultec Pro Legacy EQ
Special Processing (4)
  • Auto-Tune Realtime Access
  • Oxide Tape Recorder
  • Precision Enhancer Hz
  • Verve Analog Machines Essentials
Delay and Modulation (3)
  • Precision Delay Mod L
  • Galaxy Tape EchoPrecision Delay Mod
  • Precision Delay Mod L
Reverbs and Rooms (3)
  • Precision Reflection Engine
  • Pure Plate Reverb
  • RealVerb Pro Custom Room Modeler
Guitar and Bass (3)
  • Ampeg SVT-VR Classic Bass Amplifier
  • Marshall Plexi Classic Amplifier
  • Raw Distortion
Instruments (1)
  • PolyMAX Polyphonic Synth
UPC: 819937004582

Universal Audio x4 Gen 2 Specs

Key Specs
Channels of I/O
12 Inputs / 18 Outputs
Maximum Sampling Rate
192 kHz / 24-Bit
Number of Microphone Inputs
4
Analog Audio I/O
4x Combo XLR-1/4" TRS Mic/Line Input
2x 1/4" TS Hi-Z Input
4x 1/4" TRS Line Output
2x 1/4" TRS Headphone Output
2x 1/4" TRS Monitor Output
Digital Audio I/O
TOSLINK Optical ADAT / S/PDIF Input
TOSLINK Optical ADAT / S/PDIF Output
Host Connection
1x USB-C (Class-Compliant)
Power Requirements
AC/DC Power Adapter (Included)
General
Display
8x Color Multi-Segment LED Meter
Channels of I/O
12 Inputs / 18 Outputs
Built-In DSP
Quad-Core
Maximum Sampling Rate
192 kHz / 24-Bit
Number of Microphone Inputs
4
Built-In Microphone
No
Input Level Adjustment
1x Knob
Signal Processing
Pad
-20 dB
Gain/Trim Range
Mic/Line Inputs:
+10 to +65 dB
High-Pass Filter
75 Hz
Solo/Mute
Mute per Master
Connectivity
Analog Audio I/O
4x Combo XLR-1/4" TRS Balanced Mic/Line Input
2x 1/4" TS Unbalanced Hi-Z Input
4x 1/4" TRS Balanced Line Output
2x 1/4" TRS Headphone Output
2x 1/4" TRS Balanced Monitor Output
Phantom Power
48 V
Digital Audio I/O
1x TOSLINK Optical ADAT / S/PDIF Input (S/MUX Support)
1x TOSLINK Optical ADAT / S/PDIF Output (S/MUX Support)
Host Connection / USB
1x USB-C (Class-Compliant)
Host Connection Protocol
Thunderbolt 3
USB (Non-Host)
No
Sync I/O
No
Network I/O
No
MIDI I/O
No
Expansion Slots
No
Wireless
No
Performance
Frequency Response
Mic, Line, Hi-Z Inputs:
20 Hz to 20 kHz ±0.05 dB
Line Outputs:
20 Hz to 20 kHz 0.05 dB
Headphone Outputs:
20 Hz to 20 kHz ±0.01 dB
Monitor Outputs:
20 Hz to 20 kHz ±0.04 dB
Maximum Input Level
Mic Inputs:
25 dBu (Pad On)
Line Inputs:
20.2 dBu (Reference Level at +4 dBu)
Hi-Z Inputs:
12.4 dBu (at Minimum Gain)
Maximum Output Level
Line Outputs:
20.2 dBu (Reference Level at +4 dBu)
14.5 dBu (Reference Level at -10 dBu)
Headphone Outputs:
15.4 dBu (300 Ohms Load)
15.8 dBu (600 Ohms Load)
Monitor Outputs:
20.2 dBu
Headphone Output Power
68 mW into 300 Ohms
38 mW into 600 Ohms
Impedance
Mic Inputs:
5.4 Kilohms
Line/Monitor Outputs:
10 Kilohms
Hi-Z Inputs:
1 Megohm
Dynamic Range
Hi-Z Inputs:
122 dB (A-Weighted)
Line Inputs:
124 dB (A-Weighted)
Mic Inputs:
123 dB (A-Weighted)
Headphone Outputs:
124 dB (A-Weighted)
Line Outputs:
128 dB (A-Weighted)
Monitor Outputs:
129 dB (A-Weighted)
THD+N
Mic Inputs:
-117 dB / 0.00014%
Hi-Z Inputs:
-111 dB / 0.00028%
Line Inputs:
-115 dB / 0.00018%
Line Outputs:
-117 dB / 0.00014%
Monitor Outputs:
-120 dB / 0.0001%
Headphone Outputs:
-108 dB / 0.0004% (300 Ohms)
-112 dB / 0.00025% (600 Ohms)
Digital Audio
Sample Rates
Up to 192 kHz
Sample Rate Conversion
No
Bit Depths
24-Bit
Latency
A/D Conversion:
1.1 ms at 96 kHz
Sync Sources
ADAT, Internal, S/PDIF
Audio Storage & Playback
Media/Memory Card Slot
No
Compatibility
OS Compatibility
Windows / macOS
Mobile Device Compatibility
No
Required Hardware
Thunderbolt 3 Port
Power
Power Requirements
AC/DC Power Adapter (Included)
AC Input Power
100 to 240 VAC, 50 / 60 Hz (1.2 A)
AC/DC Power Adapter
12 VDC
Power Consumption
19 W
Physical
Operating Conditions
32 to 104°F / 0 to 40°C
Dimensions
9.17 x 5.87 x 2.51" / 23.29 x 14.91 x 6.38 cm
9.17 x 6.12 x 2.51" / 23.29 x 15.54 x 6.38 cm (Including Controls and Protrusions)
Weight
3.2 lb / 1.5 kg
Packaging Info
Package Weight
5.75 lb
Box Dimensions (LxWxH)
11.5 x 8.9 x 5.2"

Universal Audio x4 Gen 2 Reviews

The ultimate desktop upgrade

By Pawan
Rated 5 out of 5
Date: 2026-04-27

I recently picked up the Apollo x4 Gen 2, and it has immediately leveled up my workflow. I previously had Apollo Twin Quad but since I invested in some 500 series gear, I was limited in routing. This X4 has enough option for me as well as bypassing the preamp when I need. It’s a bit of an investment, but for a professional hybrid setup, it’s worth every penny.

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