• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required. There are many reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!

Antelope Amari Measurements

Hi,
First review here, so don't hesitate to tell me if you see something odd.
I just bought an Antelope Amari for mastering work and Antelope's specs were not precise enough to my taste.
Since the APX555 was just there I did some measurements. I tried to be consistent with most measurements I've seen on the forum.

DAC:
Inputs: ASIO
Outputs: XLR
Fs: 44.1kHz

Monitor:

Here's the monitor with a 0dBFS input.

Frequency Response:
Here's a sweep at 0dBFS. Keep in mind the left axis scale has 2dB amplitude.

THD+N:
THD+N for a 0dB sweep (sorry for the timeout).

Linearity:

SNR & Dynamic Range:

0dBFS at 1kHz. SNR (left) at 133dB and AES 17 Dynamic Range at 132dB.

View attachment 344783 View attachment 344784

IMD Ratio:

This measure kept timing out this is the best I could get.

Sinad vs Measured Level:

That's an exceptional SNR measurement. It might be less than Antelope claim (which is often the case) but it's still higher than any SNR measurement of any DAC that I can find anywhere. The best domestic DACs usually get to 128 to 129 dB.

Edit: Does anyone know of any other DA converter with a higher SNR and DR? Even those that are running at 12V?
 
Last edited:
That's an exceptional SNR measurement. It might be less than Antelope claim (which is often the case) but it's still higher than any SNR measurement of any DAC that I can find anywhere. The best domestic DACs usually get to 128 to 129 dB.

I think it is mostly related to the +24 dBu output level (12.28 V), at 4 V output level dynamic range is ~122 dB.

Michael
 
I don't think that's it, I think it's just a good interface. Dynamic range often plateaus at high output levels, so DR isn't necessarily proportional to output level. If it was, the DR at 4V would indeed be 9.7dB lower, or about 122dB.

Two things, though. In the first chart, the worst harmonic is about 120dB down, but the SINAD is 113dB, so that's just about noise dominated, even at 12.3V.
Next, looking at Sinad vs Measured Level, the SINAD actually drops slightly going from +14dBu to +24dBu.

This suggests that the DR will if anything be even higher at -10dBFS than at 0dBFS.

Now, Amir baselines his SINAD and DR measurements at 4V, but not everyone does. Sound on Sound test lots of interfaces, and their DR measurements are usually done at +20 or +24dBu. And the highest DR they've ever measured is the Apogee Symphony Interface at 129.0dB. The OP used a better Audio Precision analyser, but still, 132.3dB is a pretty epic result for a line level output.
 
Last edited:
I don't think that's it, I think it's just a good interface. Dynamic range often plateaus at high output levels, so DR isn't necessarily proportional to output level. If it was, the DR at 4V would indeed be 9.7dB lower, or about 122dB.

Two things, though. In the first chart, the worst harmonic is about 120dB down, but the SINAD is 113dB, so that's just about noise dominated, even at 12.3V.
Next, looking at Sinad vs Measured Level, the SINAD actually drops slightly going from +14dBu to +24dBu.

This suggests that the DR will if anything be even higher at -10dBFS than at 0dBFS.

I agree it is a good interface.

The dynamic range measurement is performed by measuring noise at -60 dBFS input level and then comparing that noise to an output level. The measurement isn't actually being done at the higher output level. This should be obvious from the noise dominated dashboard measurement at 12.38 V which is nowhere close to 132 dB dynamic range due to rising noise at the higher output level.

At -10 dBFS, the dynamic range measurement will be by definition 10 dB lower than 0 dBFS (as you already noted for 4 V output level).

Now, Amir baselines his SINAD and DR measurements at 4V, but not everyone does. Sound on Sound test lots of interfaces, and their DR measurements are usually done at +20 or +24dBu. And the highest DR they've ever measured is the Apogee Symphony Interface at 129.0dB. The OP used a better Audio Precision analyser, but still, 132.3dB is a pretty epic result for a line level output.

Personally, I like residual noise as it tells you how much noise you have in absolute terms regardless of output level. Residual noise = 10^(-132/20) x 12.38 V = 3.11 uV. This is pretty good but not exceptional these days.

Of course, the advantage of +24 dBu output level is you can pair it with a low gain amplifier and achieve very good system noise performance.

However, if you aren't using the extra output level and are pairing it with say a Hypex NC252MP with 1.67 V input sensitivity, your system noise performance will be exactly the same as a lower output level DAC with worse dynamic range but the same residual noise.

Michael
 
If I understand correctly, all SNR and Dynamic range measurements in OP's measurements are un-weighted.

Amir is measuring with CCIR-2k at 4V, which pulls his measurements down several dBs (but CCIR-2k weighting is supposed to be more in line with what we hear).

Company is using A-weighting for their specs, I suppose, so we can probably compare the weighted value in the closing text to the specs.
 
Last edited:
I think Amir is also using unweighted per the posts below. Of course it is possible something changed over time.




Michael
 
Back
Top Bottom