Apollo x4 allows musicians and producers to easily track, overdub, and mix larger projects with elite-class A/D and D/A conversion, four Unison-enabled preamps, and QUAD Core realtime UAD plug-in processing — all in a desktop Thunderbolt 3 audio interface for Mac and Windows. Apollo x4 confidently outperforms everything in its class with 127 dB D/A dynamic range, along with an included bundle of UAD analog emulation plug-ins and LUNA Recording System, giving you a fully-stocked analog studio, right on your desktop.

Apollo x4 features four Unison-enabled mic preamps, letting you track through exacting mic preamp emulations from Neve, Helios, API, Manley, Avalon, Universal Audio and many more. Exclusive to UA Audio Interfaces, 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.

The secret to Unison is its hardware-software integration between Apollo’s mic preamps and its onboard UAD QUAD Core DSP Acceleration. Simply place a Unison preamp plug-in on your mic input in Apollo Console software, and it physically reconfigures the Apollo interface's impedance — so you can tap into the classic sounds of the world’s most recorded mic preamps.

With thousands of hit songs and hundreds of Grammy-winning albums under their belt, Apollo interfaces are used to track exceptional-sounding records every day. The x4’s audio conversion delivers a striking 127 dB dynamic range and -117 dB THD+N, giving Apollo x4 a spacious, organic sound that easily rivals dedicated high-end converters.

Right out of the box, Apollo x4 offers a suite of incredible analog emulation plug-ins including the world’s only authentic Teletronix LA-2A, 1176LN, Fairchild 670, Pultec EQs, and the UA 610-B Tube Preamp & EQ. Developed by UA’s world-renowned team of algorithm engineers, these Realtime Analog Classics Plus plug-ins set the standard by which all other hardware emulation plug-ins are judged. From the tube warmth of the Pultec EQ on guitars, to the gentle limiting of the LA-2A on vocals, your recordings will take a giant leap forward in rich, sonically complex analog sound.

Beyond the included Realtime Analog Classics Plus plug-ins, Apollo x4 lets you tap into the full library award-winning UAD Powered Plug-Ins at near-zero latency, regardless of your audio software’s buffer size and without taxing your computer’s CPU. And unlike competing interfaces, these DSP-powered plug-ins are also available in your DAW for mixing.

Apollo x4 also includes Unison technology on its front panel instrument inputs, giving you access to dead-on emulations of guitar and bass amps. Apollo X series interfaces work with all major DAWs, but they become a fully integrated recording system with LUNA, Universal Audio’s groundbreaking music production application for Mac. Harness LUNA’s Accelerated Realtime Monitoring™ and power your workflow with a host of built-in features and optional extensions.

Universal Audio Apollo x4 Features

Desktop 12 x 18 Thunderbolt 3 audio interface for Mac and Windows with elite A/D and D/A conversion inherited directly from the acclaimed Apollo X rackmount interfaces
4 Unison mic preamps offer stunning models of classic tube and transformer-based mic preamps and guitar amps
UAD-2 QUAD Core Processing for tracking through vintage compressors, EQs, tape machines, mic preamps, and guitar amp plug-ins with near-zero latency
Produce with LUNA Recording System — a fully-integrated recording application made for Apollo (Mac/Thunderbolt)
2 Unison-enabled Hi-Z instrument inputs
2 independent headphone outputs
Built-in Talkback mic for communication with studio talent and recording slate cues
Includes monitor remote functions and Mono, Mute, DIM, and ALT monitor controls
Up to 8 channels of additional digital input via Optical ADAT/SPDIF input
Optical ADAT/SPDIF output for connecting to additional studio equipment
Includes the "Realtime Analog Classics Plus" UAD plug-in bundle (Teletronix LA-2A 1176, and Fairchild 670 compressors, Pultec EQs, UA 610-B Tube Preamp & EQ, and more)
Runs UAD Powered Plug-Ins via VST, RTAS, and AAX 64 in all major DAWs
Uncompromising analog design, superior components, and premium build quality

Apollo x4 Thunderbolt 3 audio interface1
External Power Supply1
AC Power Cable (IEC C7, non-polarized) Region Specific (US, UK, or EU)1
Getting Started URL Card1
Realtime Analog Classics Plus plug-in bundle1

System
- I/O Complement
- A/D-D/A Conversion
Analog I/O
- Microphone Inputs 1-4
- Hi-Z Inputs 1&2
- Line Inputs 1-4
- Line Outputs 1-4
- Monitor Outputs L&R
- Stereo Headphone Output
Digital I/O
- Connector Type: Optical TOSLINK JIS F05
- S/PDIF
- - Format: IEC 958
  - Supported Sample Rates (kHz): 44.1, 48, 88.2, 96
  - S/PDIF Channels: 2 (Stereo L/R)
- ADAT
- - Format ADAT Digital Lightpipe with S/MUX
  - Supported Sample Rates (kHz): 44.1, 48, 88.2, 96, 176.4, 192
  - Channel Assignments @44.1kHz, 48kHz: Channels 1–8
  - Channel Assignments @88.2kHz, 96kHz: Channels 1–4
  - Channel Assignments @176.4kHz, 192kHz: Channels 1–2
- Clock Synchronization Sources
- - Internal, ADAT, S/PDIF: Conditional per selected digital input type
Electrical
- Power Supply External: AC-to-DC Power Supply, Level VI compliant
- AC Input Connector Type: IEC C8, non-polarized
- AC Requirements: 100V–240V AC, 50–60 Hz
- DC Connector Type: Male plug, 2.1x5.5 mm, center positive
- DC Requirements: 12 VDC, ±5%
- Maximum Power Consumption: 19W (when portable host computer not charging)
Environmental
- Ambient Temperature Range: 32º to 104º F (0º to 40º C)
Mechanical
- Dimensions
- Weight