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Apollo x4

Apollo x4

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.

Available as Apollo Heritage Edition

Available as Apollo Heritage Edition

Featuring 10 premium UAD titles — including complete plug‑in Collections of our award-winning Teletronix,® UA 1176, and Fairchild® compressors, Helios® Type 69 and UA 610 mic preamps, Pultec® EQs, and more.

Learn More ›

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

To see full system requirements, click here.

Customer Reviews

Apollo x4

Overall Rating

D. Deurell

November 24, 2021

Analog studio that fits in your backpack!

I love my x4, its versatility and the UAD plugins! I have a whole studio with cues, "analog outboard" to colour my sound on the way "to tape", excellent converters and endless possibilities, in a very small machine. To have 4 pre amps with the unison technology makes it wery handy, and with 8 more inputs via ADAT you kan record drums no problem. I can write good stuff about it all day, the onley con is that the buttons could feel a bit more rigid im my oppinion, but its a minor thing, just go buy it if you think about it!

R. Haas

November 18, 2021

UA Apollo in a class of it’s own

Recent Apollo X4 purchase provides 4 killer pres, 2 headphones, 2 direct ins, 4 processors and acts as a desktop controller for my UA system. A perfect and portable unit for when you record with others. UA has always provided top notch support for all my hardware and software purchases.

B. Noss

November 16, 2021


I tried to reach out several times and nothing, long waiting call, if you add the option to call you back, you might receive the call then after answer less than a second they hang out the call :(

M. Medrano Brindis

November 13, 2021

X4 the best solution for home studios!.

it's easy to lay down ideas trough any interface but from there to professionals engineers loving the quality of my audio tracks. WOW. The X4 is killer!

J. Bexelius

November 12, 2021

Beautiful sound

I’ve been recording through the unison preamps for a couple of weeks now and I have to say that it sounds amazing. I still have my outboard preamps but I don’t feel the need for them most of the time now. The only downside is that when mixing in the box with many channels, I run out of processing power a bit too quickly, so I already feel that I will need to add a satellite or one of the rack mounted interfaces to the setup.

M. Bilderbach

November 8, 2021

Exactly what I was looking for!

Being able to have keys, acoustic, and vocal in all at the same time has been a definite game changer. Loving being able to run unison with 4 Inputs!

J. Lindberg

November 5, 2021

Powerful and practic

The X4 is perfect to have on the home micing table. Easy to setup and disconnect for transportation in my guitar kit box.
The easy selection between channels and between headpones for adjusting levels and settings is very appreached.

A. Ivlev

October 14, 2021

Apollo x4

I needed 4 preamps with UNISON features, ADAT expansion and dual headphone out for my tasks.
Apollo x4 gives me everything I need. I am very happy with the purchase.
But I have registered Apollo X4 during Desktop Platinum Vocal Promo and I am already the owner of all plugins from heritage list and alternative lists. Can I get different plug-in titles instead?

R. Farkas

October 11, 2021

Absolutely love my X4!

No interface is perfect IMO, but thanks amazing Unison preamps, UAD plugin accessibility, ADAT expandability, and really functional TB and monitor control, this little unit punches way above its price tag. Great centrepiece to any studio.

I. Lopez Blanco

September 29, 2021

Well Builded, Nice preamps and converters, easy to use

I love the Apollo 4X, with the quad core I can use enough plugins for my recording needs (With Apollo 8 duo was not enough). I have to say that sometimes my computer doesn't recognize the Apollo and I have to restart it several times (strange). And I would love a bit more flexibility choosing the heritage plugins, I owned quite some f the package and didn't get good options from the other plugins

M. Pearce

September 23, 2021

Everything you will ever need

Upgraded from an Apollo x duo. The quad core processing, 4 preamps, ADAT expansion and dual headphone out gives me everything I need. I'm only limited now by my own creativity :-)

B. Howard

August 30, 2021

Insanely Awesome!

I'm very happy with my purchase. You do get quite a bit of DSP which is nice, maybe more could be just a bit better but honestly this was well worth it.

R. Krapels

August 24, 2021


Where to begin,.......
I recently purchase a Universal Audio Apollo x4 QUAD Thunderbolt 3 Audio Interface (Refurbished/New) on Reverb.com directly from Universal Audio.

I received the unit a few weeks ago (I am based in Bangkok, Thailand) and I immediately noticed the box and "picture frame" inside the box as well as the box containing the adapter looked very used, pretty beat up is more accurate, I would say. And then along the away I also discovered a tiny chip on the jogwheel and some scuffing,on the right side of the unit. Then after hooking it up and downloading the software I noticed my unit was paired with an Apollo Twin MK II according to the hardware configuration in Luna/Console, I can delete the Twin, but it comes back every time I restart the software (I don't own an Apollo Twin). In any case it became pretty clear to me that this was in fact a year old (if not older) 2nd hand unit that was repaired or something then dumped back into its old beat up box and passed of as Refurbished/NEW/B-Stock on the Reverb website. All the images of the item in the listing were stock photos of a new Apollo X4, unit even though Reverb requires sellers to post photos of the actual unit and highlight any damage that the item may have, so that potential buyers are aware of the condition the item is in. I basically paid $ 1,599.00 for a device that could in fact be almost 2 years old, it's just too much money for something that old.

So then I complained on Reverb and opened a ticket directly on the Reverb website and theres was a bit of back and forth for about a week and then all communication stopped UAD stopped, possibly because they didn't like what I had to say. Also Reverb decided they couldn't support my claim either because I had bought the item in the US and then forwarded it to Bangkok, Thailand.

I am not sure what else to do here, I am simply asking for a partial refund, which could be money, credit, plugins or whatever because I am not planning to send the device back to California and incur the additional shipping charges (back and forth) and more duties and taxes etc. just to get another 2nd hand unit that may look slightly better. Quite frankly I am wondering why the world's leader in Thunderbolt audio interfaces, analog recording hardware, and UAD audio plug-ins would want or need to sell used old devices for premium prices in such a misleading way on Reverb, it just doesn't suit a company of this stature, I am appalled and disappointed but the way this has been handled by UAD so far and I sincerely hope they will reach out to me a.s.a.p. and make this right.

J. monlleo

August 21, 2021

A safe bet!

i had the apollo mark 2 and i had to sell it due to financial problems, i recovered a year later and i bought the apollo x4, a great advance, a pristine sound, better conversion and 4 preamps with unison, a safe bet!

F. fournot

July 26, 2021


As I said previously,I'm actually working with fabulous musicians for musics and songs which will appear all along an international music road movie film. Before recording and mastering in Paris and/or London studios, I wanted to have at disposal a perfect machine which enable us to prepare our works and put it at best level. I've found it with apollo x4.
BUT NOW, WHEN ONE OF THE Pink Floyd musicians, after listening, write that this song is "Rich in emotion, well played and have very good sound" , then I'm certain it was definitly a very good choice. (Certified)

J. Aguilar

July 24, 2021

15 día de conocer mi Apollo x4

Me sorprendió muchísimo la tecnología Unison, trabajar a 0 latencia es una sensación super agradable. Los procesos tiene una respuesta clara y cálida en el sonido. Atienden a detalles que mejoran el flujo de trabajo, el fácil acceso a funciones como: cambio de par de monitores, a cambio la señal de audífonos, el micrófono agregado para hablar en cabina, crean el ambiente ideal para producción muy agradable. Me gustó mucho la posibilidad de procesar la señal desde el momento de su captura, esto ahorra muchos recursos de la computadora y tiempo. Lastimosamente que cuando uno queda enamorado de Unison. Ahora tengo la sensación de querer más capacidad para procesar plugiin de UA. Estoy muy satisfecho con mi compra y 100% recomendado. Saludos desde Guatemala.

B. Conrad

July 5, 2021

Kind of underwhelming

I’m upset that Universal Audio hasn’t made its software and hardware completely compatible with apples Big Sur and m 1. I recently upgraded thinking I wouldn’t have any issues coming from my Apollo twin to the Apollo x4. I did the latest update after not being able to hear sound through the interface on my system sounds outside my daw and now can’t get any of the software to recognize the drives.

F. fournot

June 25, 2021

Try a little tenderness...

I'm actually working with fabulous musicians for musics and songs which will appear all along an international music road movie film. Before recording and mastering in Paris or London studios, I wanted to have at disposal a perfect machine which enable us to prepare our works and put it at best level. I've found it with apollo x4. Owner of an old good Raindirk 32, , and listening on Tannoy classic monitor, Arrow is wide enough for us and in accordance with the machines witch are now in all world studios. As I said, I've found it. Thanks UAD

A. Addario

June 9, 2021

X4 - The Perfect Portable Powerhouse!

Purchased for portable recording, specifically for a smaller desktop version of my Apollo 8. After some finagalling with the TB3-2 connector, got it hooked up properly to the existing 8 and 8p.
Very happy with the purchase!

F. Gálvez

June 5, 2021

UA-Apollo x4

The best decision I've made in a long time. Without a doubt the best of its kind!