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Universal Audio Apollo X4 Heritage Edition


12x18 Thunderbolt 3 Audio Interface

  • With UAD-2 Quad-core processor for virtually latency-free recordings via plug-in emulations of classic compressors, EQs, tape recorders, microphone preamplifiers, and guitar amplifiers
  • 24 bit / 192 kHz AD/DA converter
  • 4 Unison microphone preamplifiers
  • +48 V Phantom power
  • Integrated talkback microphone
  • Dynamic range: 127 dB
  • Monitor functions with controls for Mono, Mute, DIM, and ALT
  • Design: Desktop
  • Includes software bundles Rackmount Heritage edition & Realtime Analogue Classics Plus
  • Suitable case: Article Nr.


    (not included)

Technical Specifications:

  • 4 Microphone/Line combo inputs: XLR / 6.3 mm jack
  • 2 Hi-Z instrument inputs: 6.3 mm jack
  • 4 Line outputs: 6.3 mm jack
  • 2 Monitor outputs: 6.3 mm jack
  • ADAT/SPDIF optical input and output
  • 2 Stereo headphone outputs: 6.3 mm jack
  • Thunderbolt 3 connector (thunderbolt cable is not included)
  • Input for external power supply
  • Dimensions (W x H x D): 280 x 130 x 200 mm
  • Weight: 1 kg
Number of Mic Inputs 4
Number of Line Inputs 4
Number of Instrument Inputs 2
Number of Line Outputs 6
Headphone Outs 2
Phantom Power Yes
Number of S/PDIF Connectors 1
Number of ADAT Connectors 1
AES/EBU Connectors 0
Number of MADI Connectors 0
Ethernet 0
Other Connectors No
MIDI Connectors No
Word Clock No
Max. Samplerate 192 kHz
Max. Resolution in Bit 24 bit
Bus-Powered No
Incl. Power Supply Yes
Windows Thunderbolt driver Yes
Thunderbolt Version 3
Item number 508053
B-Stock from $1,988 available
The shipping costs are calculated on the checkout page.
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3 Sales Rank

21 Customer Reviews

5 19 Customers
4 2 Customers
3 0 Customers
2 0 Customers
1 0 Customers
4.9 / 5





Game changer
Pawney 05.10.2020
Fully portable, 24bit, mixing console with comprehensive library of switchable preamps, compressors, amps and dynamic, eq, reverb, and other processing plugins and emulators.

First off - I upgraded from an Arrow after approx 4 months. Not because it was not amazing but because of the quality of the UA plugins.
I cannot afford (or store) rack mounted units. I have only used them in other peoples studios so I cannot speak for how accurate these emulations are.
I can say though that I have yet to use ANYTHING that works as well as any of the UA line of plugins. Imagine doing your takes while fully mixed with imperceptive latency. And that same mix is recored direct to audio into your DAW if you choose.

Secondly, the Unit itself -
At the momnet this is the top tier of their desktop versions.
There are 4 inputs - 2 hiz/mic/line and 2 mic/line
Controls are simple but comprehensive.
Includes a talk back button with a little built in mic. A little on the heavy side of portable but totally forgivable for what it is packing.

Cons -
Does not ship with a thunderbolt cable (for the price you would think it should)
Requires it's own power source (included) which has a SOFT plastic locking mechanism. BE CAREFUL WITH IT

Questions I would have had -
QUAD core will allow you to run approx 8 to 15(maybe) dsp plugins depending on the plugin. Processing can be diverted from DSP to create additional virtual channels or vice versa.

Be aware of the additional cost of UA plugins BUT be aware that UA offer vouchers on purchases (for next purchase), offers specific to items you own and access to custom offers where stuff gets super affordable.

Lastly, I found their site FAQ on multi unit set up a bit misleading.
You CAN link multiple units but ONLY where there are 2 TB3 connections. This unit will link with their rack mounted units or DSP processors.
By and large the desktop units cannot be daisy chained or run along side each other. UA software will only connect via a single TB3 port on your Mac.


Perfect of course
BRISKEY 15.05.2021
Great gear, perfect sound, perfect quality, probably the best on the market. This is the number one for tracking and mixing.
For music creation inside a DAW while using a lot of virtual instruments, this interface makes the performance of your mac go crazy (even with an 10core i9 Mac).
There's also no build in loopback for audio streaming, which is a shame in 2021.


Oigimer 03.03.2021
What an awesome piece of gear.
Yes, It's quite expensive, but the sound ... wow! ... the UAD plugins and the unison technology are true gamechangers, I now "own" a studio loaded with racks of "you could only dream about" outboard gear .. for a fraction of the investment.

And I'm running a PC with thunderbol3, Windows 10 and presonus Studio. No problems at all. Only needed to check some UAD tutorials and make sure configuration was well made.


Universal Audio Apollo X4
Grayzer 30.06.2020
I bought this unit as part of a studio upgrade. I wanted to have the option to have a portable interface to work with my mac pro, but also be a controller for my main studio. It comes in attractive packaging (minus the thunderbolt cables). It's well contructed and the online resources are good, though some are a little dated. Installation was not hard but it is pretty lengthy. That said, a week after installing it, I really like it. I have it ADAT linked to my older soundcard (a MOTU octopre). The UAD plugins are excellent and I welcome the DSP which gives me more headroom on my ageing 2012 mac mini. The unit does get quite warm, but not hot, and is quite weighty for it's size but fits nicecly on my desk beside my keyboard and is easy to use. The marshall plexi classic amp sim is especially nice. Once installed, I created a Sonarworks profile for it and then played some music - I did immediately notice a extra smooth sheen of sweet top end detail, which I don't think I was imagining! First track was "Like Sugar" by Chaka Khan. No problems, I recommend this unit. Takes a bit of getting used to how things are done in UAD-world, but I like it.


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