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Originally Posted by audioengr /img/forum/go_quote.gif
If you can hear any difference in the first 4 files, then you have a resolving system.
I picked them correctly through the noise, but switched the 0nsec and 10nsec tracks.
Could not pick the second set of 5 correctly, although one of my customers nailed it. Some of my customers have megabuck systems. $5K speakers? Try $50K.
Steve N.
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Steve, with respect there were 4 samples and 4 slots and you got 2/4 correct. This is not picking them correctly as I see it. By random guessing alone you get 1/4
With 4 tracks you have a 25% chance of getting 2/4 correct, this is not statistically very powerful.
Also you are on record saying that you can detect 2ps of jitter so how come you thought the 0ns jitter track had 10ns jitter and vice versa.
The 2nd set had a track with 100ns jitter and one with 0ns jitter neither of which you got in the correct slot.
Could it be that jitter really is not that important at such levels ?
As for your customer nailing it well in fact
he listed 2---4----3---5---1 as low to high and the order was 2--(5/3)--1--4 so he got 2/5.
actual-- 0--100---10--10--30
Could you ask your customer to do some blind tests as that would be much more credible.
I "nailed" it, but I cheated by analyzing the waveforms mathematically.
I am running a set of DBTs in FooBar between the 0ns and 100ns files. I found a tiny section of the Joni Mitchell track which seemed slightly different in the two files round about 15 seconds in and about five seconds after the vocals start, I had to go backwards and forwards again and again and again. I am currently at 11/13 (p = 0.033) but I had to go home so have not reached a decent level (20 tests) yet, I will get back to it tomorrow. Frankly I am surprised at this result my system must be more revealing than I thought or I could just be a lucky guesser
But even if I do get 18/20 it is 100ns a figure that is so much higher than even my ten year old DAC and 20 year old CD players that it is laughable to worry about.