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Hires 96/24 listening test of opamps
Hires 96/24 listening test of opamps
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View Poll Results: Which of the files do you prefer by listening?
rr = LM4562 1 4.55%
ss= OPA2134 2 9.09%
tt = MA1458 2 9.09%
uu = TL072 9 40.91%
vv = OPA2134 1 4.55%
I can not hear a difference 7 31.82%
Voters: 22. You may not vote on this poll

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Old 17th June 2017, 12:09 PM   #1
PMA is offline PMA  Europe
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Hires 96/24 listening test of opamps
Default Hires 96/24 listening test of opamps

As a follow-up to the thread
http://www.diyaudio.com/forums/every...ning-test.html
I am posting a new opamp test, this time in 96kHz/24bit resolution. The music samples may be downloaded from
http://pmacura.cz/test_hires.zip
The file is quite big, about 160MB, as a result of higher resolution format.

The samples have a lot of information above the audio band, as you can see from the attached spectrogram. It is a true hires, not the file create by ultrasonic noise addition, as is sometimes quite usual.

The link level was now 2Vrms = 0dBFS.

The poll is valid for 10 days. Please do not write your comments to the forum, but rather send it to me to my PM here or to my e-mail address.

It would be nice if you could support your preferences by an ABX result, should be signed like in this example:
http://www.diyaudio.com/forums/every...ml#post5109759
This allows verification of validity of your result.

Thank you and have fun!
--------------------------------

Poll question "I can not hear a difference" was added on June 25. Please feel free to vote for this option in case that all the files sound same to you, without audible difference.
----------------------------------
June 27
The poll has been closed and it's time to reveal the parts used:

rr – LM4562 (1 vote)
ss – OPA2134 first take (2 votes)
tt – MA1458 (2 votes)
uu – TL072 (9 votes – big winner :-))
vv – OPA2134 second take (1 vote)

So, according to the poll, the winner is TL072 . I have also received preferences via PM and I tried to create a chart from them.

This shows a different view, very contradictory and there are not many mutual preferences among the voters.
Click the image to open in full size.
Moreover, none of the votes was supported by a valid ABX result, so I would leave to a reader to make his conclusion himself. However, there is one very interesting result, “Voter 2” preferred the parts just according their parameters with one exception, two takes of OPA2134. Great job, Mark! :-)

I have prepared some more information, together with measurements, and placed it to my web:

Op amps listening test with hires files

Thanks to everyone who participated in this test.

As a bonus, I am adding the original source file which was used in the test:
http://pmacura.cz/ww.zip
Attached Images
File Type: png hires_spectrogram.png (739.9 KB, 817 views)

Last edited by PMA; 28th June 2017 at 03:24 PM.
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Old 17th June 2017, 01:23 PM   #2
Markw4 is offline Markw4
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Just to be clear Pavel, I think you said,

Please do not write your comments to the forum,

but rather send it to Pavel by PM as per the post above, or to his e-mail address.

Last edited by Markw4; 17th June 2017 at 01:26 PM.
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Old 17th June 2017, 02:11 PM   #3
PMA is offline PMA  Europe
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Hires 96/24 listening test of opamps
Quote:
Originally Posted by Markw4 View Post
Just to be clear Pavel, I think you said,

Please do not write your comments to the forum,

but rather send it to Pavel by PM as per the post above, or to his e-mail address.
Mark, you are absolutely right.
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Old 17th June 2017, 02:42 PM   #4
scott wurcer is offline scott wurcer  United States
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Hires 96/24 listening test of opamps
Pavel, a full round would be 32 combinations is this necessary? I'm thinking of writing a Python script to randomly make up ABX combos to write to my SD card so I can do undisturbed headphone listening.
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Last edited by scott wurcer; 17th June 2017 at 02:46 PM.
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Old 17th June 2017, 02:55 PM   #5
PMA is offline PMA  Europe
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Hires 96/24 listening test of opamps
Quote:
Originally Posted by scott wurcer View Post
Pavel, a full round would be 32 combinations is this necessary? I'm thinking of writing a Python script to randomly make up ABX combos to write to my SD card so I can do undisturbed headphone listening.
Scott, it is definitely not necessary. For ABX, I would be glad if you tried just 2 pairs, any of the set.
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Old 17th June 2017, 05:22 PM   #6
Mooly is offline Mooly  United Kingdom
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Hires 96/24 listening test of opamps
Would you like ABX results posted here Pavel ?
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Old 17th June 2017, 05:28 PM   #7
PMA is offline PMA  Europe
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Hires 96/24 listening test of opamps
Quote:
Originally Posted by Mooly View Post
Would you like ABX results posted here Pavel ?
I think it would be fine, Karl.
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Old 17th June 2017, 05:30 PM   #8
Mooly is offline Mooly  United Kingdom
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Hires 96/24 listening test of opamps
OK I think first of all I will just listen and make notes for myself rather than ABX (at least to begin within).
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Old 17th June 2017, 05:37 PM   #9
PMA is offline PMA  Europe
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Hires 96/24 listening test of opamps
On a technical note: the worst opamp in this test has now THD at 10kHz = 0.064% and is about 20x worse in distortion at 10kHz than the digital chain. This is the result of higher voltage level in this test. Also, the differences in signals are higher than in the previous test. The best opamps again make a direct copy of the digital chain properties.
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Old 17th June 2017, 05:48 PM   #10
Mooly is offline Mooly  United Kingdom
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Hires 96/24 listening test of opamps
I've just been listening and in the end did ABX a couple of pairs. Nothing conclusive yet One for tomorrow and the coming days me-thinks.
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