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Old 18th January 2014, 09:39 AM   #1
Mooly is offline Mooly  United Kingdom
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Default Purely subjective test. Which do you prefer.

This is a purely subjective test and as such there is no right and wrong answer. Pure listening impressions only.

If there is sufficient interest we could can run a hidden poll on this.

IMPORTANT Please don't post any listening impressions on the thread. As we have found before, that just influences and skews the outcome. You can PM me with your choice and then after a few days the result can be made public.


How the test works. The following three groups of files (which are all .wav) are of the same test. The only difference is the music choice. The first two sets are of Genesis and the last Joni Mitchell. Neither are particularly outstanding, and date from the early and late 1970's. The Genesis in particular has a reputation for sounding a little "thin" and "glassy".

(Also the change in what you are listening to is not consistent between groups. For example if you preferred Beta over Alpha then it doesn't follow that you would prefer Lambda over Kappa or Pi over Omicron).

If you ABX these files you may well consistently pick one over the other (which would be great) but then the real question is which you prefer and why.

Here are the Dropbox links...

Group 1
ALPHA
BETA


Group 2
KAPPA
LAMBDA


Group 3
OMICRON
Pi
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Old 18th January 2014, 03:29 PM   #2
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I don't believe this will spoil anything to do with subjective listening impressions:

OMICRON/Pi are loaded into Cool Edit Pro, a waveform peak about 7.5sec into track was focused on. Based on this region tracks where realigned by 121 samples. Next sample rates where changed up 8x. At new sample rate and additional track shift of 1 sample was made. Tracks converted back to fs 44.1kHz. Amplitudes of waveforms in 2kHz region of spectrum observed, and amplitude adjustment of 0.01 dB applied. Sample differences of tracks are made, and spectrum referenced to alignment point observed:


OmPi diff spectrum.png
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Old 18th January 2014, 05:16 PM   #3
Mooly is offline Mooly  United Kingdom
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Hmm... don't know what to say to that tbh. I've never used Cool Edit so I'm not really sure what I'm looking at if I'm honest

So starting at the left we have four ? traces. Two blue and two green each overlaid (apart from slight differences). What do they represent ? What are the green and what are the blue showing ?

(Sorry for the dumb questions I need it explaining what I'm looking at)
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Old 18th January 2014, 06:19 PM   #4
BYRTT is offline BYRTT  Denmark
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Happy new year Mooly.
In few days will take a listen and PM you.
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Old 18th January 2014, 06:42 PM   #5
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by BYRTT View Post
Happy new year Mooly.
In few days will take a listen and PM you.
Thank you and a very happy new year to you too.

Come on folks, the more that listen and the better.
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Old 18th January 2014, 07:04 PM   #6
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Mooly,

This green traces are L/R spectrum of OMICRON/Pi at 7.46sec. Blue traces are spectrum of difference of two files at 7.46sec. Files as posted are not aligned. shifts in time and amplitude were applied to better align them to reduce residual seen as blue traces.

Seems that before a subjective opinion can be given about the sound of both conditions, listener needs to demonstrate ability to hear identifiable difference between the recordings.
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Old 18th January 2014, 07:15 PM   #7
Mooly is offline Mooly  United Kingdom
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Thanks for the explanation... I'll have to think about that

As to identifiable differences, yes I know for certain that I can pick one over the other nearly every time. This morning I tried an ABX on Kappa and Lambda and managed the following. Concentration waned at the end and I fluffed the last result only managing 14/15

But the only question with this test is which you prefer and why.
Attached Images
File Type: jpg Capture4.JPG (51.4 KB, 205 views)
File Type: jpg Capture5.JPG (49.8 KB, 204 views)
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Old 18th January 2014, 09:26 PM   #8
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Kappa lags Lambda by 92 samples, 2 milliseconds.

You appear to be doing ABX keeping playback position when switching tracks. This has effect of jumping forward/backwards 2 milliseconds when changing tracks. This is readily detectable when performing ABX, and needs to be eliminated as potential basis for discrimination.

Delete 92 samples from start of Kappa and see how it effects your ABX performance.
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Old 19th January 2014, 07:27 AM   #9
Mooly is offline Mooly  United Kingdom
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Thanks. The ABX result was done this time by playing each from the start (unlike before where I had to concentrate on a specific part). The audible differences are very apparent when you just listen.
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Old 19th January 2014, 09:10 AM   #10
Mooly is offline Mooly  United Kingdom
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One result in by pm (thanks Frank), clearly indicating a preference and correctly picking that preference out in all three selections. "Correctly" as in knowing what type of sound you like, not correct as in there is a right and wrong answer because there isn't.
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