UAD Spark: Now includes Hitsville EQ Collection. Create music with the best gear ever made. Try it free ›

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.

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.

Create with a Fast, Natural Workflow in LUNA

Explore analog sound and workflows with LUNA, UA’s Mac‑based recording application for producers and musicians, composers, sound designers, and more.

Designed for seamless integration with Apollo audio interfaces, LUNA gives your recordings big studio sound with built‑in extensions from Neve,® Studer,® and API® — plus inspiring instruments like Moog® Minimoog and Ravel grand piano.

Explore LUNA ›

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

m. bertin

April 28, 2022

small but hi quality still

I work like a duo in a cruise ship company and this is the best solution of all my problems Exellent Quality Lite (i always fly) simply the best and the support? Amazing they resolve all your problems very quick i am very happy

J. Berdkan

April 6, 2022

A powerhouse recording interface in a 6"x9" package!

An easy to use and understand interface, with every feature you could want or need, coupled with world-class sound quality - all in something the size of a typical paperback! I couldn't be happier with recording gear purchase!

A. Sherstnev

March 3, 2022

The perfect solution for a compact studio

I recently bought an Apollo x4 and am completely satisfied with it, the supplied plugins like LN1176 and La2A are much better than their wave counterparts. This card is the best solution that fits most studios with a margin. My m40x headphones with this card sound much louder than in budget cards and even louder than in special hi-fi amplifiers. The volume margin is very good.
I recommend!

D. Spoiala

March 1, 2022

Quality preamps, quality hardware, but not including a thunderbolt cable in the box is stupid!

Quality preamps, quality hardware and ecosystem, BUT, there are a few things that break the experience completely. How can it be that a 2000€ audio interface does not have a thunderbolt cable included. Come on guys! At least write on the website or the images of your dealers that it does not come with a thunderbolt cable. I just cannot give a better rating, this little detail is really inconvenient and stupid!

D. Wieland

February 19, 2022

High Quality, Intuitive and Portable

I purchased the Apollo to enable me to have a portable, recording and editing rig. As a ProTools HDX user in my studio, I am extremely impressed with the advancements to achieve near zero latency via the UA console, and the overall sound quality, functionality and usability of the Apollo.

M. Tremblay

February 18, 2022

Awesome soundcard!

You can’t go wrong with this baby!
Sound is awesome! It fits in your backpack.
Nicely made. Really happy with my purchase. Good job UA!

S. Barrie

January 24, 2022

ecstatic

I could not be happier with the purchase of my 4x...everything I was looking for!

J. Rowland

January 8, 2022

Apollo x4

Excellent sound and reliability. A major step up from my previous interface. I'm a UA fan now.

S. Verstraete

January 7, 2022

Love at SECOND sight.

After using Twin's and X8's from friends I was really exited to get my own Apollo. I did not hear a single bad word from other users, nor did I encounter problems when using units from others. But... day one with my own Apollo and things turned. After days of trying stuff and contacting support we concluded my unit had to go back for service... Big bummer! UA support was great though and a week later I received a new replacement unit from my dealer. I guess I was the unlucky one to receive a faulty unit out of the box?? With the new unit it's smooth sailing!!

T. PALA

January 6, 2022

tottal noice

I buy a Apollo X4 heritage edition....but after 2 months.......still working in full of noice......i want to replace my product.....

J. Moin

December 18, 2021

Fantastic Interface!

I absolutely love the X4 just a few minor things which UA should consider. X4 is in a funny place, it's much more capable than a twin but not quite a rack. So despite having several I/Os you dont get the same routing functionality as on the racks. 4 DSPs is much better than 2 but you can quickly tax them, esp with reverb and channel strip plugins. Last one which bugs me the most. You are not able to independently (unison slot from inserts) to monitor or record. In other words, I want to record the preamp (in unison) but I only want to monitor through the insert FXs. The option is for the whole insert including the unison slot. This is not the case with the racks. Maybe this can be resolved with future updates. Overall, very happy with my X4 and purchase.

M. Whitwell

December 13, 2021

Still no support for macOS 12 Monterey

The Apollo X4 is amazing when it works. Universal Audio needs to hurry up and qualify Monterey. M1 Pros have been out for nearly 2 months now.

B. Kane

December 6, 2021

Great Upgrade from Apollo Twin Solo

I got the x4 as an upgrade for a Twin MkII Solo. The problem with the Twin was too little DSP power and I wanted a couple of additional inputs for convenient reamping. I also have a satellite but those processors are not available for use with the Console app so I could barely load two Unison preamp plugins before exceeding DSP capability. The x4 has four processors so I can now load an adequate number of plugins.

I didn’t use the Console app much with the Twin Solo because of the limited DSP. It took me some time to get up to speed with the it but, fortunately, there are a lot of instructions on the Internet as to how to use it.

One of the things I like about the Apollo is that it can be used as a hybrid system. That is, in the DAW, it allows UA plugins to be used simultaneously with native plugins. Another is the quality of the ADC/DAC’s (very clean). UA plugins are very good, although a bit pricey; however, they don’t have an annual update fee (at least for now). Also, in Console you have the option to monitor or print plugin effects. If you decide not to print them to the track, you have the option to copy the plugin settings to the same plugin inserted in the DAW-very flexible.

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

EXTREMELY DISAPPOINTED WITH THE PURCHASE AND UNIVERSAL AUDIO SUPPORT

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.