Apollo x4

Apollo x4

  • Overview
  • Included Plug-Ins
  • Features
  • Customer Reviews
  • 4.6/5
    (46 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 for a fully-integrated and inspiring music production workstation

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 — 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 recording application for Mac. Harness LUNA’s Accelerated Realtime Monitoring™ and power your workflow with a host of built-in features and extensions — from genuine Neve summing and integrated Studer tape, to groundbreaking 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 www.uaudio.com.

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 help.uaudio.com


  • 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, or 10.14 Mojave


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

Customer Reviews

Apollo x4

Overall Rating

(46 reviews)

H. Lang

April 2, 2020

Just the best!!!

Yes, the switch to UAD was worth it for me and I can only recommend it to everyone. I used to have Waves, iZotope .... etc. and I never got such a good sound (analog) as with UAD. Especially with very little twirling effects, you can quickly get a great result. I put a video online a few days ago, www.youtube.com/watch?v=V2gFZ-tEVTw and was contacted by three people about what I use for software .....
I work with Mac and the Apollo X4.
Thanks to the UA team and keep it up !!! .... Lg Hely

A. Loparco

April 1, 2020

Apollo x4, absolutely blown away!

I just wanted to leave a review for anyone who is contemplating purchasing this interface. I absolutely love it and could not be happier with the quality and value that I was provided. I was having a tough time deciding between the X4 and the Twin X, however am happy I choose the X4. So far the inputs have served me well, giving me enough flexibility to record anything that has come my way so far. Also, I am happy that in the future there are several options to expand my I/O's. I would highly recommend this interface!

A. Nesse

March 31, 2020

Apollo X4, best interface in its class

Love it for the 4 preamps and the two headphone outs. 100% stable with my mac running logic. Absolutely top notch plugins, and even though they are pricy they seem worth it. Its a genius business model and will probably ruin me at some point... This is a serious piece of equipment, cant think of anything that matches it at this price point

D. Proler

March 25, 2020

The Apollo X4 is just amazing!

The Apollo X4 is an absolutely amazing product. It's now the core of my new home studio. I switched from the Line 6 Helix Family platform because I wanted to be able to record the tones from the same Marshall Jubilee amps that I own. The UAD-2 Unison plug-ins are so realistic that I can't tell the difference between the the plug-in or the actual amps using the same exact settings. The sound is incredible realistic. Worth every single penny.


March 17, 2020

Apollo x4


M. O'Flynn

March 12, 2020

Apollo X4

I'm very pleased with this interface, it has a much more even bass and lower mid playback response than my previous Apollo 'silver face' , it sounds more hi-fi generally and the extra plugin processing is very welcome. Thank you UAD.

T. Dorney

February 20, 2020

Just what I wanted

I'm stepping up from an Apollo Twin Mk.2 so I'm pretty used to the form. It's everything I wanted, more ins and outs so I can loop out through my outboard without having to unplug a pair of monitors, an extra headphone out which is a godsend, more cores (my Twin was only a duo) and the same great monitor control facilities. I love it.

M. Alkout

February 13, 2020

Really perfect

Appreciate your efforts

m. alaimo

February 12, 2020

Apollo x4

Very pleased with the Apollo 4 coming from focusrite scarlett , which was always a good workhorse, I do feel I’ve stepped up a gear, especially the difference in sound quality, which I noted immediately.. there are a few things that are annoying but with any new piece of gear ,it’s all learning curve... My reason for buying at this time was the imminent arrival of Luna which tipped me over the top...this sounds existing..

M. Seitz

February 6, 2020

Finaly Mobile!!!

I record more and more on different locations. Mixing back in the studio. The X4 ist finally the mobile tool I need to set focus to creativity - not location! What a wonderful step to music...wherever I go...
No technical Problems... No issues... MacBook Pro, X4 and an SM7B... Just perfect!!

J. Miranda Ramos

February 4, 2020

Great Mobile Device

I just got a nee Macbook Pro and the Apollo x4 to go with it. I‘m really happy with this device. I‘m able to track and mix everywhere and I‘m not missing anything from my old setup.

G. Rosati

January 27, 2020

Not windows 10 compatible as promise

Hi, the product is really good with a Mac. But as it is today is not windows 10 compatible. For this price range it should be plug and play with a driver. Sound distortion, cracking, protools session slowing down for no reason . Superior drummer 3 doesn't work at 32 sample but with my 100$ Focusrite Scarlet solo it does? Really Disappointed, I tried all the troubleshooting from their website but nothing work. I am waiting now for the support team to find a way to fix it if it is possible? Nightmare

t. dickman

January 16, 2020

Sync problems

The Apollo x4 Thunderbolt needs to be restarted regularly.
It loses it's sync and seem to have problem changing between different programs that possibly have different sampler rates.

t. dickman

January 16, 2020

Sync problems

The Apollo x4 Thunderbolt needs to be restarted regularly.
It loses it's sync and seem to have problem changing between different programs that possibly have different sampler rates.

S. Debontridder

January 12, 2020

The perfect addition to my setup.

I've been a happy UAD customer for some years now, and the company never seizes to impress and amaze me with their new products. The X4 is a perfect addition to my setup, and a sizeable upgrade from the Twin MkI I used until now. The unit performs as advertised (which is to say: it sounds amazing) and the form factor is great as well: it looks and feels like the pro piece of gear it is. I literally have nothing bad to say about this, and can wholeheartedly recommend this interface to anyone who's in the market for one. You won't be dissapointed.

P. Molenaar

January 9, 2020

Welcom to Apollo x4

Great interface with a huge step forward in AD conversion! SOLID AS A ROCK

M. Leeds

January 8, 2020

Apollo x4 has made my life so much easier...

Switching over to the Apollo x4 with a new 2019 MacBook Pro fitted with 64gb ram running Thunderbolt-3 is a screamer. I had used a ResidentAudio T4 for so long I had forgotten what clarity in audio represents. This unit is so easy to setup and plug and play into my system, I was worried something may have been missing during the install. Everything just works! Very intuitive and easy to incorporate and setup the plugins too.

Great job guys.

J. Sanchez

January 8, 2020


It’s an amazing product I recommend 100%
My review!!

S. Siddells

January 6, 2020

Almost There.. But

I'll try this review again as the first one didn't get published, ironically though, my disgruntled follow up did :-)

This unit is GREAT I/O wise, & looks to be a NEAR-PERFECT one-stop interface solution… It is soooooo close.

ALAS! UAD's software, for the most part, is great, but resource-hungry & I’m done spending $thousands upon $thousands on good software to then to pay just as many $thousands on sub-powered hardware. I’m gobsmacked.

Make this an octa-core & I will buy the x4 again.

A quad-core for a stereo channel is the equivalent to the Twin Duo - which I also had and then dumped after 9 months. A pre-amp & guitar amp plug-in seemed to buckle the Twin Duo - ditto for the x4. 2 cores per channels, is just cheap & lazy.

UAD have octa-core tech - PLEASE!!!!!! put it in the x4. I’ll pay extra.

I love your stuff (except most your guitar amp plug-ins), but, if you don’t kit your hardware out to survive the demands of your software, you will get chased out of the park… 
It's a tight game with shrinking margins & the longer you stay behind the curve, the harder it’ll be to catch up. Stay ahead.

I expect to able to run, per channel, a pre-amp, a guitar amp, a delay-unit, a verb-unit & a drive-unit (I.e Thermionic Culture, not just JC45 pedal) without resource clipping or hanging.

You have the tech, Make it happen. I’ll be in for life. No more sales or recommendation until then.

P. Grimm

January 4, 2020

Apollo x 4: la rolls des cartes son

Excellent produit, facile à installer, facile à utiliser. Les pug-ins reçus sont magnifiques de réalisme