Yes, the phase shift that corresponds to -0.1dB at 20Hz. Audible?
Once again, visual alignment of two files that are not sampled at the same moment (simultaneously) is very tricky.
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I was curious about the -6dB not quite clipping on the blue and green files. What it looks like is hard limited in analog then a LF rolloff before being A-D converted.
I took Gaucho from the CD, re-sampled it to 48K, boosted the gain +2.4dB and flipped the phase. Looking at it there are 30-40 clipped samples in this form and the level matches within .1 dB to blue and green. Hard limiting to -6dB FS and its very close to the blue and green files. What I want to know is where did the 0 down to -6 peaks get removed?
G²
PMA/Mooly, are you going to repeat the test?
We can do exactly the same or better, use the same 2 'presentations' in an ABC test. Then we get the 'equivalent' of 3 ABX trials.
Just recording one of the chains twice is probably enough to get them different enough to foil the cheats.
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Are you also recording the comments of each listener? I'm really interested in what listeners say on a repeat test.
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How many replies have we had?
We can do exactly the same or better, use the same 2 'presentations' in an ABC test. Then we get the 'equivalent' of 3 ABX trials.
Just recording one of the chains twice is probably enough to get them different enough to foil the cheats.
_____________
Are you also recording the comments of each listener? I'm really interested in what listeners say on a repeat test.
_____________
How many replies have we had?
Because one track is delayed with respect to the other - effectively, more silence has been added to the start of one of them.
Here's another guess: the low frequency roll-off is set by the DAC out and ADC in both the L+R channels. I.e 4 places: ABCD.
You did a soundcard loopback with L to L and R to R then a crossover loopback with L to R and R to L. In the latter you swapped the channels back in software afterwards.
This explains the slight difference in low freq roll off since A+C is not equal to A+D and B+D is not equal to B+C.
It also explains why one of the files wouldn't load in my mp3 player.
Green was the crossover version.
You did a soundcard loopback with L to L and R to R then a crossover loopback with L to R and R to L. In the latter you swapped the channels back in software afterwards.
This explains the slight difference in low freq roll off since A+C is not equal to A+D and B+D is not equal to B+C.
It also explains why one of the files wouldn't load in my mp3 player.
Green was the crossover version.
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What was interesting to me is that I could not really pick a difference over headphones. Had to use my speakers.
I tried both but couldn't hear a difference in either. My speakers are on a tube amp though which would mask some big differences (for example if one channel was a tube amp and the other wasn't).
Tube sound is obviously different. The opa134 was close to tube performance, but still closer to solid state. Tube sound is so different that I don't believe that famous test where no one can differentiate between a se tube amp and a ss designed to mimic a tube amp. I have guessed that they were just choosing wrong listener.
More thoughts:
Both chains have same circuits but "Blue" feed by cheap dirty consumer PSU and "Green" have better filtered PSU.
You never know, JAy. I've been in blind tests where I identified the tube amp by its smooth sound, lack of harshness and superb ambiance, as compared to the SS amp with greater dynamics, more kick but more grain and fatigue. Classic qualities of both types, easy to hear.
Only to find out at the end of the test that I got it exactly backwards. 😀
Only to find out at the end of the test that I got it exactly backwards. 😀
You cannot hear it. You have to feel it. I'm trained to do this. Here's how you can try. Play the music, enjoy it or do something else, doesn't matter. Ask yourself am I okay if the music playing all day? If it is enjoyable you would love to. If it is fatiguing you will have the urg to turn it off. Enjoyable and fatiguing are two extreme points. Two sounds having these two extremes are called having HUGE difference, like heaven and earth, because it is not about preference anymore like most differences
Hehe who knows. I know tube well enough to choose solid state as my amplifier of choice. Try listen to SYMEF. No matter what you do, solid state have strength tube amp cannot match. And vice versa.
I have spent some time trying to persuade myself that green is better and trying to find a specific section of the music where I can hear an improvement that I can describe but didn't find anything.
Previously I had been listening on headphones on my laptop/desktop because I couldn't get green.wav to work on my mp3 (which is higher quality) and my mp3 doesn't play 24 bit flac. I will try the newer versions of the wav files on my mp3.
I can't do extended listening tests on my speakers owing to lack of WAF.
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