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Antelope Discrete 4 Synergy Core review

When Antelope goes for greater Synergy
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Antelope Audio Discrete 4 Synergy Core

About a year and a half ago, Antelope released the Discrete, a new range of Thunderbolt & USB interfaces including discrete preamps, their famous FPGA module as well as the stack of audio effects that would usually come with it. Now back in June 2019, Antelope releases a new version of its Discrete 4, this time providing dual DSP chips in addition to the FPGA. Marketing ploy or real step forward?

The first thing to observe is that the Discrete 4 Synergy Core IS a Discrete 4. It has the same physical traits, same dimensions (261 x 44 x 208 mm for 1,7kg), same screen, same knobs (who changed from black to grey) and same connectors. Eventually, the “Synergy Core” logo on the front panel was added.

Discrete4SC - 2

On the front panel, we can find the first two XLR-Jack (6,35mm) combo inputs with switchable line/mic/instrument preamps. The other two analog inputs are located on the rear panel and can only be switched to line and mic level. On the right side of the front panel, we can take notice of four headphones output; it is rare enough that we should mention that all of those outputs are independent in terms of both volume and origin of the signal. In the center, there is the screen with a rather high level of definition, the three buttons and the big pushable notched knob. All of those will enable you to adjust levels for inputs (preamps) and outputs (headphones, analog monitor out and line out), and also to have a visual general overview of gain levels for the inputs, as well as to get a quick look at the clock sync and sample rate.

Even though it can be a bit more time consuming to scroll through the menus to configure this input or that output instead of having dedicated knobs, the machine is pretty fulsome at this point. But we’ll stay honest and point out that this is one of the reasons why the interface remains so compact.

On the rear, no big surprise too, with the two analog inputs we talked about earlier, plus three pairs of Jack stereo outputs (four line out and one monitor out), the BNC format Word Clock input/output, USB 2 and Thunderbolt 2 connectors, and ADAT and S/PDIF digital input/output. The external power supply can be plugged using its connector including a screw-on fitting feature, to avoid any untimely unplugging. Last thing to know is that the Discrete 4 does not have a power switch, which can be inconvenient for some people.


Discrete4SC - 4

The major innovation about the Synergy Core is the two added DSP chips to support the FPGA module, which was already in the original Discrete 4. After a few questions to the developers about this, we found out that they faced extensive period of development for the powerful FPGA. They had satisfying results for EQs, preamps and compressors, but they had to spend too much human resources to program the reverb known as the Auraverb, and that is why we could not find any modulation FXs in their plug-in catalog. This shift towards DSP would allow them to enlarge their catalog and make it more diverse, allow for shorter development times and also to integrate plug-ins from third-party software publishers. But we must keep in mind that those are just promises from the developers and potential buyers are making a bet on the future. However, Antelope promises a first plug-ins delivery at the end of the month (update 11/21/19 : 3 new plug-ins available : Vari-speed Tremolo, Space Flanger and Opto 2A. More is coming with Antares' Autotune), even though with the 36 included effects (mainly compressors, EQs, mic preamps and amp simulations for guitar) you can already keep yourself busy. Those are good, but not replacing our personal favorites that we can find at Positive Grid for example. The EQs and compressors, still, offer solid value and we use them on our live monthly podcast. Antelope also offers to sale plug-ins, which prices are gravitating around those of Universal Audio’s (250 to 300€). Apparently, this is the price to pay for integrated effects to audio interfaces…


We will observe as well the presence of the Auraverb reverb, of many good uses, even though you can use only one at a time. A master de-esser and the AFX2DAW are also available in the store. The latter will allow you to use Antelope effects in your favorite DAW (up to 16 plug-ins, 4 effects per plug-in) which is a great news! However, only Mac and Thunderbolt users could benefit from this feature and its price is fairly high (195€). Too bad!


We set the buffer size at the minimum (32 samples) in order to get the lowest latency possible: 0,96ms for input and 0,96ms for output (in 96 kHz) were measured. That’s an excellent result, thank you Thunderbolt!

To test the interface, we assessed it with our APx515 by Audio Precision, and we will compare the results with the ones from previously tested interfaces.

Here are the results with line level signals, at a sample rate of 96 kHz:

deviation ligne

thd ligne

With a deviation of ±0,171 dB, the Discrete 4 Synergy Core is ranking pretty well, given its price and the amount of inputs/outputs it offers. We can find better results elsewhere (the last Apollo got ±0,097dB), but most often for a far superior price (2,5 times more for 4 preamps). This result seems pretty much normal to us, and we’ll notice a very light roll-off at the upper end of the spectrum (talking here in one-tenths of a dB).

The distortion always remains under the 0,002%, whatever the frequency might be. This result is also very good at this price tag, even though we can find better elsewhere but often at much greater expenses.

Here are the results for mic level signal with the gain set at 34 dB.

deviation microthd micro

The deviation got us surprised as it is slightly better (±0,138 dB), which is greatly appreciated, and we’ll notice the same outline with a light roll-off at the upper end of the spectrum. The distortion remains identical with the line level, with less than 0,002% throughout the spectrum. Those two results show that the integrated mic preamps are very transparent, which is a good thing considering that the manufacturer is offering preamp simulations in its catalog.


As far as the background noise goes, we obtain 93 dB of signal to noise ratio at 34 dB gain level, a very honest result considering the price.


We also tested the headphone output and the results are quite satisfying as well, with an almost identical deviation of ±0,144 dB, a distortion rate lower than 0,003% (at maximum volume), a signal to noise ratio at 95 dB, and power at 7,9 Vrms, which is not a lot but highly sufficient with the majority of headphones.


To sum up, audio performances seem ultimately satisfactory given the price and the number of inputs/outputs. This is often one of Antelope’s biggest strength.

Wrap up

Antelope adds one more string to its Discrete 4 bow through the addition of two DSP chips, a sign of a brighter future as far as plug-ins goes. The developers’ promise is to offer more diverse effects (reverbs, modulation effects) and in a larger amount, even though the included catalog is already pretty full (36 effects!). We hope that they’ll keep their word (update 11/21/19 : already 3 new plug-ins available), because the Discrete 4 Synergy deserves it, considering its good price to performance ratio.

  • Discrete4SC - 1
  • Discrete4SC - 5
  • Discrete4SC - 8
  • Discrete4SC - 2
  • Discrete4SC - 6
  • Discrete4SC - 3
  • Discrete4SC - 4
  • Discrete4SC - 7
  • deviation ligne
  • thd ligne
  • deviation micro
  • thd micro


  • Good audio performance given the price
  • 36 included effects
  • Quality of the compressors and EQs
  • Thunderbolt and USB 2
  • Mac and Windows
  • Minimal latency in Thunderbolt
  • Compact
  • 4 independent headphone outputs
  • 4 preamps
  • The promise for DSP and future plug-ins
  • Front panel controls are practical
  • Less convinced by the virtual guitar amps
  • AFX2DAW is optional, not given and only available for Mac/Thunderbolt
  • nimbu paani
    nimbu paani
    New AFfiliate
    1 post
    Hi! Proud new user of discrete 4 sc! Trying this beauty out, sounds amazing! However, is it normal to run the preamp quite high in order to get a decent signal for line inputs? I am connecting my nord keyboard, selected the line input which has -6 to 20db range. And I am having to turn the preamp gain up to 80-90% to get a decent signal. The monitors output levels are also quite up there.
    Is this normal behavior? Thanks !
  • TheFunkyNerd
    New AFfiliate
    1 post
    Just got the Discrete 4 Synergy Core and wow, the converters are oustanding. What a separation, detail, width, depth... The difference for Arturia Audiofuse 8Pre is tremendous. Haven't had the time to record yet, but I know what these preamps are capable of.
  • LowerLemons
    New AFfiliate
    1 post
    I read this review of the Antalope "Discrete 4 synergy core" interface. I think this interface seems to be really attractive in a lot of ways! Maybe Im wrong!? At least the hardware. From what I been reading about Antalope the downside is the drivers and reliability when it comes to updates for old models etc. dont know but that is what users seem to be not so satisfied with. At least some years ago. But. The benchmark numbers for SNR whas presented in the review, it did not seem so great, 93 dB? Maybe this is not a problem really and a good compromise from antalope? There is no report attached to the review so I cannot see the whole thing but the number is presented and in relation to some other interfaces that you have benchmarked in another review (for UAD Apoolo Twin mark II) the reaults for those are quite much better for SNR at least (all above 100 dB). Antelopes own spec, for Discrete 4 SC, is only for Dynamic range but they have stated it to be 121 dB which seems really good. Do you @AudioFanzine (or somenoe else) have any comment on the sound quality of the Discrete 4 and the SNR and DR, is it a noisy interface or can this be measured in a different way with different results? It was not really commented in the review that the SNR value was quite low so it got me a little confused. Would appreciate if you could comment on this, if possible, and maybe supply the full test report? Im not much of an expert so would appreciate to be enlighten a bit more!

    Best regards!

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