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Old 31st January 2014, 08:45 AM   #11
Mooly is online now Mooly  United Kingdom
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Quote:
Originally Posted by abraxalito View Post
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.
Pretty much identical to this. Yes I/V conversion and the usual anti aliasing filter arrangement
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Old 1st February 2014, 02:00 AM   #12
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Inspired by Jay's comments, , I'll grab the samples of this one, and go through the exercise ...
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Old 1st February 2014, 02:19 AM   #13
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Quote:
Originally Posted by Mooly View Post
Pretty much identical to this. Yes I/V conversion and the usual anti aliasing filter arrangement
Thanks Mooly - unless I'm kidding myself that looks to be something very similar to a Philips CD104 player with SAA7030 4X oversampling digital filter.

Classic model indeed
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Old 1st February 2014, 06:59 AM   #14
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Quote:
Originally Posted by abraxalito View Post
Thanks Mooly - unless I'm kidding myself that looks to be something very similar to a Philips CD104 player with SAA7030 4X oversampling digital filter.

Classic model indeed
Yes the picture is actually of a CD303, and the one in the test is a CD150 with virtually identical signal processing circuitry. All these Philips players were pretty similar electrically I seem to recall.
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Old 1st February 2014, 07:00 AM   #15
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Originally Posted by fas42 View Post
Inspired by Jay's comments, , I'll grab the samples of this one, and go through the exercise ...
Frank. Your a star
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Old 3rd February 2014, 05:56 PM   #16
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It would be good to have some more votes on this one. Frank is the only one brave enough to put a full set of results forward so far together with interesting comments on the sound differences as he heard them.
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Old 6th February 2014, 07:12 AM   #17
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Well interest in this one was lacking unfortunately with only one complete set of results submitted (thanks again Frank), so with that in mind here is the key and the result.

Participant. File. Actual. Match choice Result. (Yes for correct, no for incorrect)

fas42 Test01 TLE2072 X Yes
fas42 Test02 LM4562 Y Yes
fas42 Test03 TLE2072 Y No
fas42 Test04 TLE2072 X Yes
fas42 Test05 TLE2072 X Yes
fas42 Test06 TLE2072 Y No
fas42 Test07 LM4562 Y Yes
fas42 Test08 LM4562 Y Yes
fas42 Test09 LM4562 X No
fas42 Test10 TLE2072 X Yes
fas42 Test11 TLE2072 Y No
fas42 Test12 LM4562 X No


Copy and paste of key.


Test_01 = TLE2072
Test_02 = LM4562
Test_03 = TLE2072
Test_04 = TLE2072
Test_05 = TLE2072
Test_06 = TLE2072
Test_07 = LM4562
Test_08 = LM4562
Test_09 = LM4562
Test_10 = TLE2072
Test_11 = TLE2072
Test_12 = LM4562

Standard reference files.

X = TLE2072
Y = LM4562

Copy and paste of your results:

X: 1, 4, 5, 9, 10, 12
Y: 2, 3, 6, 7, 8, 11
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Old 6th February 2014, 07:27 AM   #18
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Purely random result. Same as in your passive test, same as in my test cap1, cap2, cap3: Mundorf x Roederstein.
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Old 6th February 2014, 08:20 AM   #19
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Consistent with the number right, at least, .

Jay felt he had no trouble distinguishing the 2, shame he didn't submit a try. Overall, my feeling is that inconsistencies in the state of the electronics between takes, and the characteristics I focus on to separate the samples don't tie in with what is being tested for, hence the meaningless outcomes. Electronics varying in their subjective capabilities from one time to the next is what I've been 'battling' with for years now, so I'm not at all surprised, in retrospect.

The cap1, cap2, cap3 test is a classic example of where nominally the same hardware produces different results, at the subjective level - and no clear reason why ...
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Old 6th February 2014, 08:22 AM   #20
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Quote:
Originally Posted by fas42 View Post

The cap1, cap2, cap3 test is a classic example of where nominally the same hardware produces different results, at the subjective level - and no clear reason why ...
Which applies to your hardware sound impression, only

I have seen NO positive ABX result to support this opinion.
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