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Forum: Audio Theory, Setup, and Chat   12-14-2014, 03:58 PM
Replies: 939
Views: 40,057
Posted By Kees de Visser
Last summer (2014) I found out why the Pono...

Last summer (2014) I found out why the Pono looked so familiar, so I took a picture. French gas pipelines are marked with "ponos":

http://www.galaxyclassics.com/public/Pono_in_France.jpg
Forum: Audio Theory, Setup, and Chat   11-24-2014, 02:23 AM
Replies: 939
Views: 40,057
Posted By Kees de Visser
Assuming we've been looking at the same data, I...

Assuming we've been looking at the same data, I can't find anything abnormal. It looks like correct 16-bit dither with a tiny bit of noise shaping. I'm puzzled why your -75dBFS reading is so much...
Forum: Audio Theory, Setup, and Chat   11-17-2014, 05:39 AM
Replies: 939
Views: 40,057
Posted By Kees de Visser
I agree. Interestingly even Bob Stuart himself...

I agree. Interestingly even Bob Stuart himself states on page 11 of his 1997 high-resolution document (https://www.meridian-audio.com/w_paper/Coding2.PDF):

JJ explained some time ago:

In...
Forum: 2-Channel Audio   11-03-2014, 06:59 AM
Replies: 2,208
Views: 112,278
Posted By Kees de Visser
Don't despair too soon. Berger's results could...

Don't despair too soon. Berger's results could not be confirmed during another test by Sean Olive, who commented:
Forum: Audio Theory, Setup, and Chat   11-02-2014, 03:34 PM
Replies: 939
Views: 40,057
Posted By Kees de Visser
OK, then you have an excellent SRC that doesn't...

OK, then you have an excellent SRC that doesn't audibly modify the content below 20 kHz (assuming standard settings). Did you compare 192 and 44.1 by upsampling 44.1 to 192 or did you listen at...
Forum: Audio Theory, Setup, and Chat   11-02-2014, 02:10 PM
Replies: 939
Views: 40,057
Posted By Kees de Visser
Which RX version did you use for downsampling ?...

Which RX version did you use for downsampling ? You might want to try the recent 4.01 update.
Forum: Community News & Polls   10-19-2014, 05:44 AM
Replies: 262
Views: 8,543
Posted By Kees de Visser
Amir, we don't hear digital data. I agree that...

Amir, we don't hear digital data. I agree that there is no (relevant) difference below 20 kHz "in the digital domain". Have you tried to compare the sound at or near the eardrum ? The question IMO is...
Forum: Audio Theory, Setup, and Chat   08-18-2014, 03:26 PM
Replies: 221
Views: 17,957
Posted By Kees de Visser
I partly agree. It is however the responsibility...

I partly agree. It is however the responsibility (competence if you like) of the operators to verify that the software they use doesn't produce errors. If it does, the errors should be fixed or they...
Forum: Audio Theory, Setup, and Chat   08-18-2014, 08:06 AM
Replies: 221
Views: 17,957
Posted By Kees de Visser
I did warn...

I did warn (http://www.avsforum.com/forum/91-audio-theory-setup-chat/1585994-avs-aix-high-resolution-audio-test-ready-set-go.html#post25400138) Scott though within 24h after publishing the first test...
Forum: Audio Theory, Setup, and Chat   08-14-2014, 06:26 AM
Replies: 456
Views: 18,698
Posted By Kees de Visser
I'm not up to date on all the past discussions,...

I'm not up to date on all the past discussions, so I hope this isn't redundant or universally debunked.[/quote]It has been debunked I'm afraid.
According to J.D. (jj) Johnston, who follows this...
Forum: Audio Theory, Setup, and Chat   08-12-2014, 06:40 AM
Replies: 456
Views: 18,698
Posted By Kees de Visser
This URL...

This URL (http://www.avsforum.com/forum/91-audio-theory-setup-chat/1585994-avs-aix-high-resolution-audio-test-ready-set-go.html#post25383978) is the original post about the test.

AFAIK users are...
Forum: Audio Theory, Setup, and Chat   07-23-2014, 07:46 AM
Replies: 221
Views: 17,957
Posted By Kees de Visser
Hi Scott, perhaps I've missed it, but has been...

Hi Scott,
perhaps I've missed it, but has been specified what kind and what level of dither has been applied (for both down- and up-conversion) ?
The 16-bit dither in "On The Street" and "Mosaic"...
Forum: Receivers, Amps, and Processors   07-12-2014, 01:40 AM
Replies: 18,779
Views: 747,015
Posted By Kees de Visser
Newbie question: is Atmos only used for sound for...

Newbie question: is Atmos only used for sound for picture, or are there plans for music-only releases as well ?
Forum: Audio Theory, Setup, and Chat   07-04-2014, 12:48 AM
Replies: 2,919
Views: 80,753
Posted By Kees de Visser
I have just tested the validity of the supplied...

I have just tested the validity of the supplied source material. Similar to making sure the med lab instruments are sterile :) Sorry if this wasn't clear.
Forum: Audio Theory, Setup, and Chat   07-03-2014, 03:14 PM
Replies: 2,919
Views: 80,753
Posted By Kees de Visser
Not a difference file, but a difference mix: the...

Not a difference file, but a difference mix: the real time output of the DAW mixer. The advantage is that every adjustment can be heard right away. If two files are identical, the mixer output will...
Forum: Audio Theory, Setup, and Chat   07-03-2014, 02:32 PM
Replies: 2,919
Views: 80,753
Posted By Kees de Visser
I somehow expected that :) OK. Use any DAW,...

I somehow expected that :)
OK. Use any DAW, open both stereo files in a 4-track project and do a nulltest (inverse polarity of one pair, mix them and listen to the master output). Now align them to...
Forum: Audio Theory, Setup, and Chat   07-03-2014, 12:38 PM
Replies: 2,919
Views: 80,753
Posted By Kees de Visser
I found the level difference of 0.2dB between...

I found the level difference of 0.2dB between Scott's testfiles by ear. I can't hear ultrasound, so that value might be different for others who can hear ultrasound, although I doubt it.
What...
Forum: Audio Theory, Setup, and Chat   07-03-2014, 05:36 AM
Replies: 221
Views: 17,957
Posted By Kees de Visser
Isa, AFAIK Sonic SRC uses fixed point...

Isa, AFAIK Sonic SRC uses fixed point calculations, which means that clipping a signal is destructive and final. Most modern SRCs use floating point, which allows lowering >0dBFS signals without loss...
Forum: Audio Theory, Setup, and Chat   07-01-2014, 09:42 PM
Replies: 221
Views: 17,957
Posted By Kees de Visser
You should look at the track peak values (higher...

You should look at the track peak values (higher is louder). Sorry for being vague. I'm trying not to spoil the test for those who don't use an ABX application :)
Forum: Audio Theory, Setup, and Chat   07-01-2014, 08:41 PM
Replies: 221
Views: 17,957
Posted By Kees de Visser
Scott, I find the difference to be consistent....

Scott, I find the difference to be consistent. Can you please re-check ?
It would make sense though, since many SRCs create a bit of headroom to prevent filter ripple from creating overloads. It's...
Forum: Audio Theory, Setup, and Chat   07-01-2014, 12:00 AM
Replies: 221
Views: 17,957
Posted By Kees de Visser
Scott, I noticed two problems with the testfiles:...

Scott, I noticed two problems with the testfiles:

1) The pairs are not sample accurately aligned. This is essential for seamless ABX switching.
2) There is a 0.2 dB level difference between the...
Forum: Audio Theory, Setup, and Chat   06-28-2014, 03:15 AM
Replies: 2,919
Views: 80,753
Posted By Kees de Visser
I suppose that's Harman? Interesting. What do you...

I suppose that's Harman? Interesting. What do you think of Sean Olive's (Manager of Subjective Evaluation) introduction of formalized, double-blind product testing around 1994?
Forum: Audio Theory, Setup, and Chat   06-20-2014, 02:49 AM
Replies: 2,919
Views: 80,753
Posted By Kees de Visser
Our perception of noise must be very different.

Our perception of noise must be very different.
Forum: Audio Theory, Setup, and Chat   06-19-2014, 12:13 AM
Replies: 231
Views: 9,093
Posted By Kees de Visser
Luckily quite a few are excellent, so there is...

Luckily quite a few are excellent, so there is hardly any excuse for not using a near-perfect SRC. These tests were done in the digital domain. You can see that artifacts are at a very low level,...
Forum: Audio Theory, Setup, and Chat   06-18-2014, 03:36 PM
Replies: 2,919
Views: 80,753
Posted By Kees de Visser
Arny, jitter values are usually expressed in...

Arny, jitter values are usually expressed in seconds (ns, ps etc.). Can you give the jitter levels of your 5 testfiles ?
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