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Old 28th January 2014, 09:32 AM   #1
Mooly is offline Mooly  United Kingdom
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Default Listening Test Part 2. Active Circuitry.

This is the second of two listening tests and is for active powered circuitry, the other thread is HERE and is for passives.

PLEASE READ THE OTHER THREAD AS THAT GIVES FULL INSTRUCTIONS ON HOW THE TEST WORKS.

The links to the files are at the end of this post.

What is this test about ?

This test is between two different opamps, an LM4562 and an FET TLE2072. For those of you that have seen and taken part in previous tests I can assure you that the equipment used here is NOT the Sony CDP790 but a Philips based DAC using twin TDA1540 convertors and with supplies of -/+12 volts for the analogue stages.

Your results.

Please read the other thread for full instructions and mark your results "OPAMPS" for this test.

And above all, ENJOY

Links,

https://www.dropbox.com/s/432julrqkma68zi/X.wav
https://www.dropbox.com/s/ifq22qdb0kf3wfm/Y.wav

https://www.dropbox.com/s/c313uad5yyfk84x/Test_01.wav
https://www.dropbox.com/s/ogpiv79nreu07bc/Test_02.wav
https://www.dropbox.com/s/sbe0pg6g09i3ogy/Test_03.wav
https://www.dropbox.com/s/zx1yv8ppc3s0xlk/Test_04.wav
https://www.dropbox.com/s/gs6az861wdaz2j2/Test_05.wav
https://www.dropbox.com/s/4ab15xffc42yoss/Test_06.wav
https://www.dropbox.com/s/5k7z33gvtk0nruo/Test_07.wav
https://www.dropbox.com/s/21vzdn3esi1l0v9/Test_08.wav
https://www.dropbox.com/s/lfq7l0se6qpz6zy/Test_09.wav
https://www.dropbox.com/s/sv920vdpqd6cev8/Test_10.wav
https://www.dropbox.com/s/5l9euwavcbf90tn/Test_11.wav
https://www.dropbox.com/s/4rbjx7oahkl30jp/Test_12.wav
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Last edited by Mooly; 31st January 2014 at 08:00 AM. Reason: TDA1450 should read TDA1540.
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Old 28th January 2014, 07:16 PM   #2
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Any audible change has measurable differences.

TLE2072 hack is clear example.
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Old 28th January 2014, 07:30 PM   #3
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Quote:
Originally Posted by Barleywater View Post
Any audible change has measurable differences.
That's certainly true, but many people claim otherwise, or (equivalently) claim that our measurement protocols are not sophisticated enough to pick up the differences that their immaculate pinnae can.
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Old 28th January 2014, 07:31 PM   #4
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by Barleywater View Post
Any audible change has measurable differences.

TLE2072 hack is clear example.
So easy to pick out then ? Have you determined which files are the TLE2072 and which the LM4562
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Old 29th January 2014, 04:42 AM   #5
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That's what Frank is for.
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Old 31st January 2014, 12:01 AM   #6
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Just downloaded and had a bit of a listen to X and Y ... for me, these two versions are much closer than the Passives reference tracks, the clues, cues are quite a bit more subtle. Yes, I hear a difference - but the sorting of the samples into 2 bins will require considerably more focus, I suspect ...
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Old 31st January 2014, 12:10 AM   #7
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What's a TDA1450? I tried googling, no chips meeting that description. Did you mean TDA1540?
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Old 31st January 2014, 07:59 AM   #8
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Quote:
Originally Posted by abraxalito View Post
What's a TDA1450? I tried googling, no chips meeting that description. Did you mean TDA1540?
I do... apologies. Too many years as a TV tech with all those TDA chips rattling round my head (first post amended)
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Old 31st January 2014, 08:06 AM   #9
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by fas42 View Post
Just downloaded and had a bit of a listen to X and Y ... for me, these two versions are much closer than the Passives reference tracks, the clues, cues are quite a bit more subtle. Yes, I hear a difference - but the sorting of the samples into 2 bins will require considerably more focus, I suspect ...
Interesting that you find these a tougher test. Out of the passives and actives, this was the one where I felt differences would be most apparent, particularly after experience of the other opamp tests. The TLE2072 seems an oddball chip (which it shouldn't be) and I didn't want to dismiss it out of hand despite the previous tests.

As before... thanks You are one of the few to be approaching these tests in the true spirit they were offered... which is to give them a listen.
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Old 31st January 2014, 08:13 AM   #10
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Thanks for the clarification

So are these chips operating as I/V converters for the TDA1540 or are they line stages after another chip (inside the CD player presumably) has done that function? Just curious to know how much ultrasonic stuff they're being subjected to here.
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