Apollo x4

Apollo x4

  • Overview
  • Included Plug-Ins
  • Features
  • Customer 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 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, 10.14 Mojave, or 10.15 Catalina


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

Customer Reviews

Apollo x4

Overall Rating

I. Qasemi

October 12, 2020

The Rolls Royce of Audio products and Interfaces

This product is unbelievably efficient and the sound quality which comes from this Apollo X4 is beautiful. You get a nice clean warm sound as is before you even hook up any plugins or preamps of your own for warmth. I will be adding the Apollo X8 to my rack as well and use both the X4 and X8. Overall I love this product.

J. Roesli

October 7, 2020

Awesome addition/upgrade to my studio

Started with the Arrow a few years back and out grew it. Looked for best option to upgrade and the Apollo x4 is perfect. Looks, records, sounds, and performs at a professional level making ITB recording and mixing a reality. On top of that the integration with the ever improving LUNA gives you unlimited flexibility.

w. Prost

October 5, 2020

Love the Apollo x4!

I’m very happy with this audio interface with great useful plugins!
It’s small, powerful and fits beautifully under my iMac Pro screen! With the same color.

P. Leisten

September 30, 2020


Great haptic and quality. If you own ultimate bundle already they give you others to pick from. Definitely worth the money.

J. Kujawka

September 29, 2020

UAD has done it again

What can I say...unit is just awesome. Recently switched from Twin X to get more I/O and all those years a have been using the Apollo line, never been disappointed. Great quality, really good preamps and plugins selection. It's hard not to like it ....cheers

L. Gonzalez

September 27, 2020

Its an amazing interface with nothing to envy to the biggest

It is an excellent interface, capable of anything, with nothing to envy to the biggest. Their preamps are of the highest level, and I love unison. The talback is a great addition. I am very happy with it and I recommend it to anyone

M. Kylliäinen

September 26, 2020


Heart of my homestudio.


September 26, 2020

Top Quality Product

Best portable Apollo choice starting your workflow!!!

J. Wyma

September 19, 2020

Upgrade from Apollo Twin Solo Silverface

I was getting frustrated with my Twin's lack of DSP. I often use the Fender Tweed 55 as a Unison insert and that was all my Twin could handle. I would have to waste time shutting off the Tweed just to tune between takes. I also began trying to record my band at rehearsal and only having two microphone inputs was too limiting for my needs.

The X4 solved a lot of these issues and more. Having 4 inputs - especially having 2 HiZ inputs - makes recording in a number of scenarios much easier. Having 2 headphone cues is also very nice. I have a UAD-2 Satellite so that combined with the X4 exceeds my current needs and gives me room to grow.

B. Coal

September 16, 2020

Its a good product, but the value is half there

This is my first time buying appolo but my second time buying Universal Audio products. My first purchase was the ox top box which I am in love with. I wish the appolo measured up. I know when I get the plugins I will like the product but its a bummer feeling to pay so much for an item and feel like you cant enjoy it till you've spent more money on the plugins that should have co.e with it. And by more money I mean, like another almost $3000 cdn. Sticker shock has set in and i feel i didnt get my moneys worth. When comparing the two products and what I got for my money I was dissipointed with the appolo. Not because it is not good equipment, but because it wasnt a complete package and was quite expensive to only get half the product or an incomplete experience. It should have come with the full package of plugins for the price I paid, or if they really can't justify including the plugins in that price they should have at least raised the price of the unit and included it in the box. I also did not like that the appolo did not have midi support. Also, a monthly subscription or financing options for the plugins would be at least a better idea so that they can be more accessable and budget friendly for the musician that just bought an already expensive item.

S. Sechi

September 12, 2020

love the new X8

Bought one after my old Apollo 8 got toasted by an electrical storm . Using the new X8 with a 5-year old Mac and a Thunderbot 2 cable-adaptor, and it is still way faster than the old A-8 and seems to have a lot more CPU-power too. Plus it sounds great. Highly recommended.

M. Borholm

September 8, 2020

Upping the ante

I’ve been using an Apollo twin duo quad core for a few years now and have not had a problem so it would stand to reason that when the x4 came out it would be the logical choice to upgrade to, I decided to do a full studio upgrade with a new MacBook Pro ,49inch curved screen, softube console and fader and an octo satellite all using thunderbolt 3 through a hub and I could not be more elated awesome sound easy to set up and use along with luna the future looks and sounds great.

G. Morales

September 7, 2020

Good Interface

Apollo X4 is pretty good. The A/D converter is excellent and can be hear in the sound quality. The Hi Z input is also really good. The pre-amps are also top notch with the mics I used. I haven't played with all the plugg-ins given with my purchase, but not fully impressed just yet, so I will keep my comments abt the pluggins for later. I would have given full 5 stars, but there are a couple of things I don't like. One is the heat in the unit. It gets scary hot, so I put a laptop cooler under it to keep it somewhat cooler. The other is the fact that my browser shows all the UA pluggins, when I only have about 20 that came with the purchase, which makes it hard to browse and use them.

D. Vogel

September 5, 2020

Finally there

A beautifully built and fantastically sounding music interface - I finally found my favorite music companion that I was looking for a long time. Especially love two high-z inputs and the two headphone outputs on the front panel are a game changer. Well done, Universal Audio.

m. nasseri

August 31, 2020

A paradigm shift.

Apollo provides an exponential increase in the capabilities I had with previous home studio setups.
Solid, well-engineered hardware with seamless software and firmware integration. Apollo, Unison and Luna provide the optimal digital workflow with analog emulation good enough to fool or appease the purists.

L. Dozier

August 30, 2020

Great audio interface

I love my x4 Apollo. To have for 4 mic/line inputs is great! I have 2 line inputs for my keyboard and 2 for my Sphere L22. Just enough inputs for my project size.

S. Edgell

August 25, 2020

A Sound Investment

Sounds wonderful, as do the plugins provided with it. I can even hear the difference (warmer and clearer) between this and my trusty Apogee interface. The first tracks recorded using Luna or Logic Pro sound great.

E. Williams

August 5, 2020

The portable UA interface I was dreaming of

I got the x6 and not long after UA released the x4 which is the thing I really wanted/needed to replace my Twin: fits in my backpack, has enough cores to support a real mix and 2 headphone outs (the biggest flaw of the Twin IMO). So I sold the x6 and got the x4, loosing a grand. Because the x6 and x4 markets overlap, I think UA should have been honest and announced the whole X series together to avoid loyal customers like me to waste money.

C. Martínez

August 3, 2020

Best Interface I've ever had

This interface has just completely changed the way me and my band now see the experience of recording. Unison preamps are beyond amazing. UAD has really done it: bridging the gap between the analog and digital world. Watch how it will all change from now on. UAD did it.

L. Kim

August 3, 2020

For musicians too, not just for recording techs...

I'm a musician, not a recording engineer, so I like things good and (cheap) and simple. After fiddling with the Apollo, I realized it's MUCH easier and quicker getting to a really good recorded sound, so I can focus on the music. To be fair, it IS more complicated to setup than the battery powered mixer/recorder I was using, but with a little bit of a learning curve, the payoff is studio quality sound from a portable setup.

Also recording an electric guitar direct was never really an option for me before...but the direct options on the Apollo are really indistinguishable from mic'ed amps. I still prefer to perform with a live amp in a room, but judging purely from the recorded sound I can dial in a sound that is EXACTLY like what I'm getting through a mic'ed amp - that's amazing.