This though edges on the psycho acoustic issues as well as the compression
and other distortions issues.
In many cases, I cannot tell tthe difference between a home made cd of a
vinyl and the real one. The only time it notices is if you go overboard with
click suppression or rumbe and other noise reduction as on dying echoes you
hear the watermark effect or the little blips in level where the click used
to be.


However some of the early recordings I made when DAB was still relatively
new sound much better than a repeat of the same material on the same station
escpecially if that is radio 2. it seems engineering on that station is now
a gain riding auto level control and a compressor.
Brian

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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"Don Pearce" wrote in message
...
On Sun, 22 Jan 2017 02:30:47 -0800 (PST), Phil Allison
wrote:

Johan Helsingius wrote:



I once did a blind listening test on an audiophile forum to
see if people could hear a difference between "hi-res" and CD.
As an outlier test, I threw in a 256K mp3 file (decoded to
FLAC, so people couldn't tell from the file format what it
was). The mp3 file came out as the second most preferred of
all 9 alternatives - the "winner" was the 16/44.1 file that
I had increased the volume by 1 dB on...



** That is a really worthless test methodology.

About 3 decades ago, I came up with a simple and really powerful one that
avoided the horrible problems inherent in all A then B or ABX type tests.

Ocne set up, the test takes only a few seconds before the result is clear
and convincing.

Unless your test operates in a similar way, it has no credibility with or
impact on any listener. The principle is that of INSTANT change-over,
while listening in stereo, in your home to your best loved tracks.

Read about it he

http://sound.whsites.net/absw.htm


Got any questions - I'm right here, every day.



.... Phil



I find instant switchover causes problems, particularly in the bass
end. If the two systems happen to have opposite phase, there will be
an apparent sound change when switching over, even though the sound is
actually the same. I like to have about half a second of dead air to
wipe the phase memory. That way you only hear the actual differences,
not the artificial transient of the phase shift.

d