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Antelope Amari Measurements

Toine

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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.

1706139756992.jpeg




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

Monitor:

Here's the monitor with a 0dBFS input.

1706139878651.png



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

1706139900870.png



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

1706139923670.png



Linearity:

1706139936577.png



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

1706139955032.png
1706139965532.png



IMD Ratio:

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

1706139988429.png



Sinad vs Measured Level:

1706140023354.png




ADC:


Inputs: XLR
Outputs: ASIO
Fs: 192kHz


Monitor:
Monitor for a 23.9dBu input.

1706140290710.png



SNR & Dynamic Range:
Signal to Noise Ratio (left) from 0dBFS is 128dB. AES17 Dynamic Range is 124dB. Measured with a 20kHz bandwidth.

1706140356766.png
1706140397504.png



Frequency Response:

Taken at +23dBu.

1706140636864.png



IMD Ratio:

1706140692596.png



Headphone Amp:

Input: ASIO
Output: HP1 (Unbalanced then balanced)
Fs: 44.1kHz


Had to so measurements are in mono. So no channel matching etc sorry.
The headphone amp has a "membrane weight compensation" setting. The lower it is the louder is it's output.
All measurements were made with that setting in its minimum position of -4.6 Ohm.

Unbalanced SNR:
600 Ohm Load, from 0dBFS

1706141008188.png



Unbalanced THD+N Ratio vs Measured Power:
Firstly 300 Ohm resistive load


1706141280969.png



Then 32 Ohm resistive load

1706141355251.png



Balanced SNR:
600 Ohm resistive load, from 0dBFS

1706141478968.png


Balanced THD+N vs Measured Power:

Firstly 300 Ohm resistive load

1706141564959.png



Then 32 Ohm resistive load

1706141635499.png



Official Specs:
1706141993423.png

Closing Thoughts:
I'm curious of what you think about these.
The DAC A-Weighted SNR is 135.7dB so around 2dB off from the 138dB announced. I do like the distorsion measurement though.
I'm not sure what to think about the headphone amp. The unbalanced output seem to be better.
The ADC looks pretty good except that weird plateau in IMD starting at +5 dBu.
One selling point still remaining is the oven controlled clock as I couldn't set up the j-test.
 
Last edited:

JSmith

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Hi,
First review here
Hi and welcome to ASR. :)
Since the APX555 was just there
Well that's a nice item to just have there, bonus.

As a reviewer, please request a reviewer tag by sending @amirm a PM;


JSmith
 

Blumlein 88

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Thanks for the testing. I have one of their less expensive devices which is pretty good. But it isn't equal to the results you get here. Good job on the testing.

Welcome to ASR. An excellent first posting and first thread.
 

Hemi-Demon

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Pretty expensive for 4 CS4398 chips and a AK5578. It measures pretty well other than the headphone output.

Does this unit have 48V phantom power?

Great first post by the OP, amd thanks for taking the time to share your findings :D
 

Blumlein 88

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Pretty expensive for 4 CS4398 chips and a AK5578. It measures pretty well other than the headphone output.

Does this unit have 48V phantom power?

Great first post by the OP, amd thanks for taking the time to share your findings :D
Don't think it has microphone preamps on board so no 48 v phantom power.
 

GXAlan

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1706161135789.png


This 0 dBFS shows 12Vrms. What happens if you send a -9.5 or -10 dBFS signal to get 4V or so? Is there any way to get the output voltage down?
 

Eldus

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What makes this ADC a "mastering" ADC?
 
OP
T

Toine

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This 0 dBFS shows 12Vrms. What happens if you send a -9.5 or -10 dBFS signal to get 4V or so?
You can kinda make that out on the SINAD vs measured level graph. But I tested it as a +24dBu line in/out, it's less easy to compare with other DAC measurements sorry about that.

Is there any way to get the output voltage down?
As in a special function ? Not really, TRS outputs have +18dBu
 

DSJR

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Hope you'll be able to test gear more widely available in Europe/UK if possible - Welcome :)

This 'mastering' A-D-A is £2750 in the UK it seems from a quick search, so maybe a bit pricy for what it offers a domestic user performance wise?

Now what we need is someone in Europe with a Klippel who's happy to test speakers not available in the US...
 

IamJF

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SNR is normally measured with A weighting - that would be part of the difference.

A/D SINAD is not nice, lot's of H3 too. Did you do SINAD over level? Maybe THD ocours with that high level in the front stage electronics and it's better at lower level.

I just recently bought an Antelope Zen Q USB as a high quality mobile interface. Didn't measure it for now but it's noisefree - will do for measurements ;-)
But the software and drivers ... it has no chance to exchange RME for reliable studio use.
 
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Toine

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SNR is normally measured with A weighting - that would be part of the difference.
Yep of course, the DAC's A weighted SNR is 135.7dB. I should have precised that in the statement.

Did you do SINAD over level?
I'll include that in a second round of measures. I wanted to test the balanced headphones out as a stereo line out just to see what it does.

But the software and drivers ...
I've read the horror stories but it went ok for me for now. I'll eventually see in lengthy sessions.
 
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