Universal Audio Apollo X4 Heritage Edition


12x18 Thunderbolt 3 Audio Interface

  • Featuring UAD-2 Quad processor for near-latency-free recording via plug-in emulations of classic compressors, EQs, tape machines, mic preamps and guitar amps
  • 24-Bit / 192 kHz AD/DA converter
  • 4 Unison microphone preamps
  • +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 bundle Rackmount Heritage Edition & Realtime
  • Analog Classics Plus
  • Matching case: Article no. 495524 (not included)

Technical specifications:

  • 4 Mic/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 input and output optical
  • 2 Stereo headphone outputs: 6.3 mm jack
  • Thunderbolt 3 connection (Thunderbolt cable not included)
  • Input for external power supply unit
  • Dimensions (W x H x D): 233 x 66 x 151 mm
  • Weight: 1.46 kg
available since December 2020
Item number 508053
sales unit 1 piece(s)
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
Free shipping incl. VAT
Available at short notice (usually 2-5 days)
Available at short notice (usually 2-5 days)

This item has been ordered with our suppliers and should be in our warehouse in the next few days.

Standard Delivery Times
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.


Awesome interface!
HeaPunk 15.05.2020
I am producer and sound engineer. I needed a better unit to record some small band sessions, because quite often I felt that my Focusrite 18i8 couldn't provide me quality I wanted. Also I am using it on my home studio as a primary audio interface and mixing console.

Step up I got with this baby is big... stop, no. It's HUMONGOUS !!!!!

- Preamps are really good and clear, especially DI inputs !
- Amazing console software what gives tons of flexibility
- UAD plugins and unison technology !!!
- Solid build quality
- Portable
- Talkback installed
- 2 Headphone outputs
- You can get 5 plugins if you know someone who already having a UAD interface
- Great support and community for UAD users
- Suits for live situations

- Thunderbolt 3 cable is not included, spent extra 45€ on it, since I realized that simple USB Type-C doesn't work with it 😃
- Main knob is a little bit wobbly, but it seems to be a usual thing on most UAD Apollo interfaces

I think it is the best audio interfaces out there with lots of potential for my sound engineer future. This machine is super portable and could handle a lot!

Thanks UAD and Thomann!
These kind of things are boosting my creativity and urge to work harder!


YouTube on this topic