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Apollo x4

Apollo x4

  • Overview
  • Included Plug-Ins
  • Features
  • Customer Reviews
  • 4.7/5
    (83 reviews)
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Elite Audio Conversion and Four Unison Preamps, All on your Desktop.

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.

Built upon UA’s 60-year heritage of audio craftsmanship, 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.

Record and mix with elite-class A/D and D/A conversion — with the widest dynamic range and lowest noise of any desktop interface

Four Unison-enabled preamps — track larger projects with near-zero latency through preamp emulations from Helios,® Neve,® API,® Manley,® and more*

Onboard UAD QUAD Core processing lets you track and mix with the included Teletronix LA‑2A and 1176 compressors, Pultec EQs, and 610‑B Tube Preamp & EQ plug-ins

Includes LUNA Recording System — a fully-integrated and inspiring music production application

Four Unison Preamps: Get the Genuine Sound of Neve, Helios, API & More

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.

Watch the Unison Shoot Out (hardware vs. software) video

Elite-Class A/D and D/A Conversion

Elite-Class A/D and D/A Conversion

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. To improve on the previous generation of desktop Apollo interfaces’ class-leading audio conversion, UA engineers redesigned the x4’s audio conversion to deliver 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.

Apollo: The Choice of New-School Professionals

Apollo is the confirmed choice of hit-making professionals, used to record landmark albums by Kendrick Lamar (DAMN.), Chris Stapleton (From A Room: Volume 1), Arcade Fire (Everything Now), Post Malone (Beerbongs & Bentleys), and many more. The Apollo range of interfaces has earned numerous industry awards from Sound on Sound, Future Music, and Electronic Musician — as well as the prestigious TEC Award for computer audio hardware five years running.

A Full Suite of Classic<br>Analog Processing Onboard

A Full Suite of Classic
Analog Processing Onboard

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.

See Included Plug-Ins   |   Watch the live tracking video

Access the World of UAD Powered Plug-Ins

Beyond the included Realtime Analog Classics Plus plug-ins, Apollo x4 lets you tap into the full library award-winning UAD Powered Plug-Ins — including vintage EQs, Compressors, Reverbs, Tape Machines and more — at near-zero latency, regardless of your audio software’s buffer size and without taxing your computer’s CPU.

With exclusive emulations from Neve, Lexicon, Capitol Studios, API, Manley, Ampex, Fender, and more,* it’s like having an endless analog studio, right on your desktop. And unlike competing interfaces, these DSP-powered plug-ins are also available in your DAW for mixing.

Record with Vintage Amps

Apollo x4 also includes Unison technology on its front panel instrument inputs, giving you access to dead-on emulations of guitar and bass amps like the Fender '55 Tweed Deluxe, Marshall Plexi Super Lead 1959, and the Ampeg B-15N Bass Amplifier.

LUNA Recording System<br />Deep Apollo Integration with a Fast, Natural Workflow

LUNA Recording System
Deep Apollo Integration with a Fast, Natural Workflow

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 — from genuine Neve summing and integrated Studer tape, to inspiring LUNA instruments, and more.

Expanded I/O and Built-in Talkback Mic

Expanded I/O and Built-in Talkback Mic

In addition to its four onboard Unison-equipped preamps, Apollo x4 offers two headphone outs and two Hi-Z instrument inputs — greatly enhancing your collaborative process. Plus, with a total of four line outs, optical ADAT/SPDIF input and output, plus dedicated monitor remote controls and a built-in Talkback mic, the 12 x 18 Apollo x4 can serve as the powerful centerpiece of your professional desktop studio.

Build a Networked Studio

Build a Networked Studio

Users of any Thunderbolt-equipped Apollo interface can combine up to four Apollos and six total UAD-2 devices — adding I/O and DSP as your studio grows. Once you expand your studio with an Apollo x6, x8, x8p, or x16 rackmount unit, you can use Apollo x4 as a desktop monitor control while still tapping its additional I/O and DSP power.

*Apollo x4 includes the “Realtime Analog Classics Plus” UAD plug-in bundle. Other UAD plug-ins sold separately at

Realtime Analog Classics Plus Bundle

With the Realtime Analog Classics Plus plug-in bundle, you not only get legendary compressors such as the Fairchild® 670 and EQs like the Pultec® EQP-1A, but also stunning guitar and bass amp emulations from Softube, and UA’s landmark 610-B Tube Preamp and EQ plug-in.

  • UA 610‐B
  • Marshall Plexi Classic Amplifier
  • Fairchild 670 Legacy
  • Teletronix LA‐2A Legacy
  • UA 1176LN Legacy
  • UA 1176SE Legacy
  • Pultec EQP‐1A Legacy
  • Pultec Pro Legacy
  • Ampeg® SVT-VR Classic Bass Amp
  • Precision Channel Strip
  • Precision Reflection Engine
  • Precision Delay Modulation
  • Precision Delay Modulation L
  • UA Precision Enhancer Hz
  • Raw Distortion
  • RealVerb‐Pro

UA 610-B Tube Preamp and EQ

UA 610-B Tube Preamp and EQ

Impart your tracks with the iconic warmth and character of the classic hardware used to track everyone from Duke Ellington to Coldplay. By emulating the entire signal path, including tube amplifiers, transformers, and circuit nonlinearities, the 610-B Tube Preamp and EQ plug-in injects organic detail and saturation to any signal — whether you’re re-amping or tracking through the 610-B via Universal Audio’s Unison™ technology.

Marshall<sup>®</sup> Plexi Classic Amplifier

Marshall® Plexi Classic Amplifier

The undisputed alpha dog of rock and roll guitar amps, the Marshall “plexi” amplifier is as legendary as the music it helped create. From Jimi Hendrix to Jimmy Page, Duane Allman to Eric Clapton, the Plexi’s punishing melange of snarl, sustain, smoothness, and raunch defined the sound of rock. Developed by Softube, the Marshall Plexi Classic Amp plug-in gives you the sound of this iconic amp with a perfectly placed microphone from engineer Tony Platt who recorded AC/DC’s Back in Black and Highway to Hell.

Fairchild<sup>®</sup> 670 (Legacy)

Fairchild® 670 (Legacy)

The world’s most coveted compressor, the classic Fairchild 670 tube limiter will give your tracks and mixes unmistakable tube warmth and character. Whether you’re looking for subtle compression on a lead vocal, or grittier textures that can work on guitars, bass, or a drum bus, the Fairchild 670 plug-in adds a classic “glow” to anything you run through it.

Teletronix<sup>®</sup> LA-2A Classic Leveling Amplifier (Legacy)

Teletronix® LA-2A Classic Leveling Amplifier (Legacy)

With its gentle, program dependent optical compression and meticulously designed tube amplifier, the LA-2A is the go-to compressor for professional mixers around the world — especially for vocals. Incredibly easy-to-use Peak Reduction and Gain controls gives you the ideal optical compression sound for guitar, bass, drums, and more.

1176SE/LN<sup>®</sup> Classic Limiting Amplifiers (Legacy)

1176SE/LN® Classic Limiting Amplifiers (Legacy)

Get classic, ultra-fast FET compression from the world’s most recognized compressor. The 1176 will impart punch, presence, and character as well as its signature distortion overtones on drums, vocals, guitars, and bass. The 1176LN has graced countless recordings, from Led Zeppelin, to the White Stripes and Michael Jackson.

Pultec<sup>®</sup> Pro Equalizers (Legacy)

Pultec® Pro Equalizers (Legacy)

Mix with two of the most sought-after hardware EQs ever made — the MEQ-5 Midrange Equalizer and the EQP-1A Program Equalizer. Both of these tube-based icons deliver smooth and silky EQ curves with an abundance of warm analog character.

Ampeg<sup>®</sup> SVT-VR Classic Bass Amp

Ampeg® SVT-VR Classic Bass Amp

Introduced in 1969, the Ampeg SVT bass amp is still the reigning king of high-powered tube bass tone. Developed by Brainworx, the Ampeg SVT-VR Classic Bass Amp plug-in perfectly captures the raw power and punch that has made this the go-to amp for rock, funk, and soul players. Track in real time using Unison™ preamp technology for the tone, touch, and feel of a real SVT bass amp, or transform bland DI tracks with the thunderous roar of a stone cold classic.

Precision Mix Rack Collection

Precision Mix Rack Collection

Featuring the Precision Channel Strip, Precision Reflection Engine, and Precision Delay Modulation plug-ins, the Precision Mix Rack Collection offers four modern, high-fidelity plug-ins for recording and mixing. Powerful and intuitive, Precision Mix Rack Collection gives you an impressive tool set — perfect for beginners and seasoned professionals alike.

UA Precision Enhancer Hz

UA Precision Enhancer Hz

Expertly dial-in your music’s low-end frequencies with the Precision Enhancer Hz plug-in. Able to yield exacting results with minimal adjustment, the Precision Enhancer Hz can add weight to kick drum samples, fatten up a synth bass, or simply make the low-end of your tracks more audible on smaller speakers.

Raw Distortion

Raw Distortion

Modeled from a vintage early-’80s Pro Co Rat, Raw Distortion delivers all the gritty dynamic raunch of the legendary stompbox. And with Unison™ technology, you can plug in to Apollo Twin, 8, or 8p’s front-panel Hi-Z instrument jack and experience the same circuit interaction, gain range, and clip points for the true tone, feel, and response of the original hardware.

RealVerb Pro

RealVerb Pro

RealVerb Pro is a flexible, natural sounding reverb based on UA’s own unique set of algorithms. Allowing you to design the room just as you hear it, the RealVerb Pro goes beyond simply big/small or dark/bright, giving your sources distortion-free, smoothing diffusion control and ultra-long reverb tail.

Key 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 featuring the Teletronix LA-2A 1176, and Fairchild 670 compressors, Pultec EQs, UA 610-B Tube Preamp & EQ, and more. Other UAD plug-ins sold separately.

Runs UAD Powered Plug-Ins via VST, RTAS, and AAX 64 in all major DAWs

Uncompromising analog design, superior components, and premium build quality

Free, industry-leading technical support — on the phone and online — from knowledgeable audio engineers

Apollo X Series System Requirements


  • Thunderbolt 3 cable (not included)
  • Internet connection to download software and authorize UAD plug-ins
  • 6 gigabytes available storage
  • Quad Core i7 or better processor recommended
  • For additional compatibility information, visit


  • Available Thunderbolt 1, 2, or 3 port
  • Thunderbolt 1 and 2 connections require an Apple Thunderbolt 3 to Thunderbolt 2 Adapter (not included)
  • macOS 10.12 Sierra, 10.13 High Sierra, 10.14 Mojave, or 10.15 Catalina


  • Available Thunderbolt 3 port
  • Windows 10 (64-Bit Edition)

Customer Reviews

Apollo x4

Overall Rating

(83 reviews)

UAD User

July 4, 2020

Amazing upgrade! Works great with Ryzen 9 & ASRock Creator x570

Top of the line upgrade from my old Focusrite Pro-40. Quality of the X4 is amazing, built like a tank. I'm using two optical cables to connect the old Pro-40 for 8 more I/O's Very glad I decided to get this unit instead of saving more for the 8p. And in case anyone is wondering, yes it works perfectly with Ryzen 9 3950x, ASRock Creator x570 with TB3, on Win10 Pro. Perfect addition to my PCIe OCTO as well. Thanks for a great product UA!

H. Kim

July 4, 2020


Good Quality!

N. Pinto

July 1, 2020

Powerful and amazing

Great piece of gear. The only issue I had was the fact that the thunderbolt 3 cable wasn't included (!>!) so I had to wait an extra day to set it up...

K. McCarley

June 30, 2020

Windows Drivers Need WORK

This device is incredibly powerful, and the plugins make it sound amazing. But the Windows drivers are almost completely unusable. WDM sounds like hot garbage, 32-bit ASIO is non-existent, and sometimes even the 64-bit ASIO generates some digital artifacts. Thankfully, the 64-bit-only ASIO driver clumsily works well enough to run it through VoiceMeeter to use it with everything else. But it's kind of ridiculous that UA hasn't addressed this issue yet, and claims the device works on Windows devices. Clearly that's not entirely true.

A. Kapadia

June 25, 2020

Software setup was tricky, but excellent customer Service

After I received the interface, I followed the instructions on the get started guide. The instructions were fairly simple, but the installation process was extremely buggy. I sent a help request to Universal audio, and followed up with a phone call. The Agent on the phone call, Warren S, sat with me for an hour to help me install the software. The line accidentally disconnected in the middle of the installation process, but within a few minutes, Warren called me back. I was not necessarily pleased when I first tried to set the device up, but with the brilliant customer service help, I was up and running.

R. Graterol

June 18, 2020

Significant step up from Apollo Twin duo

I’m very happy with the x4. The upgrade is significant coming from a Apollo twin duo silver. The quad processing and dsp pairing finally makes dsp tracking good at every level. The unit is lightweight, probably same as the twin which is nice to carry.
Design is beautiful. Can’t recommend this enough, if you can afford it you will be very satisfied.

A. Diederich

June 14, 2020

Great to have this much IO in a desktop format

Great quality unit, sounds phenomenal recording tracks, and the plugins are addictive. I had the arrow, and while this is the gateway, the extra horsepower makes this so much more flexible. Now the arrow goes with me and the MacBook Pro and the Apollo x4 is the hub of the primary machine. Now my daughter and I can track and listen with headphones at the same time. Yeah, it’s a covid purchase but it’s worth every penny even when I’m not stuck at home.

W. Childress

June 14, 2020


All I can say is wow. I waited many years to finally be able afford an Apollo and it was well worth the wait. Very excited to join the UA family.

R. Graterol

June 11, 2020

Significant upgrade from Apollo Duo Mk1

I’m enjoying the X4 a lot. The upgrade from the first generation of Apollo’s is significant. The industrial design is top notch. The quad processing In tandem with dsp pairing takes it to a whole new level for tracking for me.

The unit is super light and sounds great. It is a hefty price, but for those taking recording seriously this is a fantastic tool. Also from a production standpoint, this is a fantastic box. I’m happy with my investment.

A. Edwards

June 9, 2020

To infinity & beyond

The Apollo x4 is literally hardwired into imagination itself! The extra DSP ceiling and architecture allows for your imagination to stretch its’ legs. Wizards are real and they work at Universal Audio.

M. Takahashi

June 5, 2020


The sound from Apollo x4 is magic.
Total balance, bass and all sounds exist vividly.

It’s really useful for private studio or home studio after the era of Covid-19.

Big thanks!!!

C. King

June 5, 2020

Bought a Townsend mic so bought an Apollo x4, then a satellite. I'm hooked!!

So I bought a Sphere L22, and I knew the apollo was essential to use it properly, but now I've discovered the world of UAD pre-amps, blimey.... blown away... !

J. Slavin

June 5, 2020

X4 Everything I thought and more

Bought an Arrow on an impulse.... loved it .
Saw the offer of £840 worth of vocal plugins with the x4, and here we are, I now fancy a complete system x6, x4 and a satellite, so I’ve got a fair bit of kit to shift, I love this stuff, and may even use it live instead of a mixer, looks easily doable, and will be the best live sound I’ve ever had. So, flexible, portable, powerful, it sounds ****** ridiculously good... if you’ve got the cash, buy it, or have a serious look at what you have, and raise a bit of cash with that, you’ll be amazed how many bases it covers

J. Walser

June 4, 2020

Phantastic device, especially with LUNA!

My task was to record a young artist on a Steinway model B. I chose the X4 with 4 great Mics and using LUNA and adding great plugins gave me one hell of a toolset to work with and extremely high fidelity results!

D. Meier

June 2, 2020

Very Nice Product

I'm really happy with the X4. The hardware is top notch and most importantly the usability is really nice and way better compared to other competitors (and I owned a lot of them....)

I would appriciate, if the last loaded plugins would stay persistent after reboot as sometimes I use it as a mixer for two synths...without a computer. The software ecosystem is a bit pricy in my opinion.

D. Faehl

May 29, 2020

Best desktop interface on the market.

Apollo X is hands down the best desktop interface on the market. X converters take the Apollo to a new level. 4 inputs is great for mobile singer songwriter recording because I’ve always liked a stereo mic pair on acoustic guitars and pianos while recording vocalists.

If this is your first UAD device I recommend purchasing the following for vocals:

Neve 1073 preamp
CL1B Compressor (1176 -> LA2A works too)
Studer Tape (makes everything mesh like butter)
Capital Chambers Reverb

You’ll thank me later

A. Gallab

May 28, 2020

Game Changer

I've worked exclusively with a Motu Ultralite until I got an Apollo last week. It has completely changed my work flow and creativity for the better. Entering the UAD Plug-In Universe has given me so much to work with. I don't think that I'll ever go to a proper studio again. I feel re-inspired and so excited about what this will do to my music.

Technically, I am so blown away by the quality of the pre-amps and power of the apollo. I'm even more blown away with how much BETTER my work flow has gotten once I paired this bad boy with a Octo Core Satellite. This has been a complete game changer for me!

R. Nicolazzo

May 23, 2020

I freekin love this device

This interface rocks-the build quality is amazing, flexible size, amazing plugins included! Links perfectly to my live rigg (Apollo 8) to add extra inputs and sends to drummer (click and stereo keys) as well as to my personal QSC speakers for self control of my stage monitoring volume.

Love love love the X-4 !!

Thanks Rachel Z @OzmosysBand

A. Eleftheriadis

May 22, 2020

Stellar unit

This is the ultimate unit for a musician to work at home. Enough inputs to do tracking at home, super powerful DSP with low delay monitoring, and a great physical interface to work with. I have been tracking at home, completing recordings that were started at a top-of-the-line studio here in Greece, and it has been wonderful. We recorded vocals, bouzouki, baglama, accordion, all with superb clarity. Luna has a also proven to be a great tool. I only missed a couple of functions, like moving the playhead with cursor keys, or being able to find the date on specific takes (audio files). I switched from another Thunderbolt unit from a competing vendor, and I very happy that I did. Great work guys.

R. Wouw

May 20, 2020


Best addition to my home studio