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Audibility of speaker nonlinear distortion - test
Audibility of speaker nonlinear distortion - test
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Old 14th November 2017, 04:52 PM   #41
PMA is offline PMA  Europe
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Audibility of speaker nonlinear distortion - test
Thanks to all who posted the results on sine tones.

I have prepared a test with real music. Distortion has been added mathematically, which is always a pain, because in the real speaker the distortion depends on frequency and higher amplitude may excite further distortion, non-harmonic. Both I am unable to simulate.

The distortion profile used is attached and applies only for amplitudes as in the plot. For smaller amplitudes, distortion is decreased, which is similar to normal speaker.

Test files are at

http://pmacura.cz/flute.zip

It is a flute concert and forte is in the second half of the sample.

Please try the files and in case of a positive abx result, please post it here. I can make everyone sure that this test will be much more difficult than those with the sines.
Attached Images
File Type: png flutedist.PNG (114.2 KB, 153 views)

Last edited by PMA; 14th November 2017 at 04:54 PM.
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Old 14th November 2017, 06:43 PM   #42
Mooly is offline Mooly  United Kingdom
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Audibility of speaker nonlinear distortion - test
I would like to say I got a positive result (I did) but I couldn't repeat the trick The following tests I ran gave a 6/8 and then a 5/8. Maybe fatigue was setting in.

Code:
foo_abx 2.0.4 report
foobar2000 v1.3.16
2017-11-14 18:23:00

File A: flute distorted.wav
SHA1: 2fb3327e56efb5a10ec5783b4cc3848b56a29be8
File B: flute.wav
SHA1: acef85edba0a2bc1b5ae970763d8f5ea389bd98a

Output:
DS : Primary Sound Driver
Crossfading: NO

18:23:00 : Test started.
18:23:25 : 00/01
18:23:58 : 01/02
18:24:11 : 02/03
18:24:35 : 03/04
18:24:45 : 04/05
18:24:55 : 05/06
18:25:07 : 06/07
18:25:18 : 07/08
18:25:18 : Test finished.

 ---------- 
Total: 7/8
Probability that you were guessing: 3.5%

 -- signature -- 
40234b358700d19b12d8ff2107952ba7264471c1
Code:
foo_abx 2.0.4 report
foobar2000 v1.3.16
2017-11-14 18:31:11

File A: flute distorted.wav
SHA1: 2fb3327e56efb5a10ec5783b4cc3848b56a29be8
File B: flute.wav
SHA1: acef85edba0a2bc1b5ae970763d8f5ea389bd98a

Output:
DS : Primary Sound Driver
Crossfading: NO

18:31:11 : Test started.
18:31:58 : 01/01
18:32:15 : 02/02
18:32:27 : 02/03
18:32:39 : 03/04
18:32:54 : 04/05
18:33:07 : 05/06
18:33:17 : 05/07
18:33:35 : 06/08
18:33:35 : Test finished.

 ---------- 
Total: 6/8
Probability that you were guessing: 14.5%

 -- signature -- 
068f88e392ef9b1f4024f2be23591b2b4899a37d
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Old 14th November 2017, 06:47 PM   #43
PMA is offline PMA  Europe
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Audibility of speaker nonlinear distortion - test
Wow, that is a great result, Karl!!!
Have you concentrated on the drum bang, or an a flute?
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Old 14th November 2017, 06:57 PM   #44
Mooly is offline Mooly  United Kingdom
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Audibility of speaker nonlinear distortion - test
It was on the flute. I can't even honestly say in what way it sounded different, maybe timbre on the harsher leading edges.
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Old 14th November 2017, 07:17 PM   #45
PMA is offline PMA  Europe
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Audibility of speaker nonlinear distortion - test
See how the distortion is fading away (esp. high order components) as the signal is decreased ....
Attached Images
File Type: png dist_flute_-4dB.PNG (105.8 KB, 140 views)
File Type: png dist_flute_-8dB.PNG (106.4 KB, 138 views)
File Type: png flute_concert.PNG (79.7 KB, 137 views)

Last edited by PMA; 14th November 2017 at 07:22 PM.
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Old 14th November 2017, 07:25 PM   #46
Pano is offline Pano  United States
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Audibility of speaker nonlinear distortion - test
The Rouse flute concerto is much harder than the pure tones - and flute is a rather pure instrument. I think I can hear some differences, but so far not ABX success.

Here is another version of the same piece.
YouTube
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Old 14th November 2017, 08:01 PM   #47
scott wurcer is offline scott wurcer  United States
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Quote:
Originally Posted by RNMarsh View Post
Well, this should settle the matter. Scott and Geddes and any others who dont seem to believe one can hear much of anything in the way of distortion.
Sine waves are not music and speakers do not have constant distortion with level or frequency. I do see JBL does not see fit to make that information readily available. Carry on with this if it makes you happy.
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Old 14th November 2017, 08:48 PM   #48
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Audibility of speaker nonlinear distortion - test
Quote:
Originally Posted by scott wurcer View Post
speakers do not have constant distortion with level
We do not test on constant distortion with level.
Attached Images
File Type: png transf.PNG (14.8 KB, 128 views)
File Type: png nonlinmag.PNG (15.9 KB, 46 views)
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Old 14th November 2017, 10:48 PM   #49
scott wurcer is offline scott wurcer  United States
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Quote:
Originally Posted by PMA View Post
We do not test on constant distortion with level.
You'll have to convince me there exist (serious) speakers that are expansive and compressive. Not to say there aren't any but how about monotonically decreasing non-linearities before the exotic stuff.
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Old 15th November 2017, 12:51 AM   #50
scott wurcer is offline scott wurcer  United States
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Quote:
Originally Posted by RNMarsh View Post
Well, this should settle the matter. Scott and Geddes and any others who dont seem to believe one can hear much of anything in the way of distortion. I would guess they have not spent much time critically listening.
Dick you should go to Burning Amp sometime, I'm sure you would be a big hit.
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