Newsgroup: it.hobby.hi-fi
Titolo: cavi e abx test

Conclusions
To many in the engineering community, blind ABX is an accepted
experimental design. Using the blind ABX protocol, we failed to hear
any differences between an assortment of generic power cords and
Nordost Valhalla. Therefore, we cannot conclude that different power
cords produce a difference using the blind ABX protocol. However, we
also cannot conclude that there are no differences. We simply failed
to prove that differences can be detected to a statistically
significant degree using a blind ABX protocol.
John Johnson, who comes from a scientific background, suggests that if
there are differences between cords, they appear to be so subtle that
a blind ABX test cannot discern them with small numbers of
participants. Failure to discern them could be due in part to the time
it took for cable changes, and the possibility that accurate auditory
memory is shorter than that. It may be necessary to switch between
cords in a much shorter time.
Unfortunately, as John notes, we don't know of a way of accomplishing
fast power cable changes, since, unlike interconnects which can be
simply switched between A and B with the equipment all still powered
on and playing music, changing AC power cords requires turning the
equipment off, switching the cords, and then powering them back on.
The test was a grand and noble experiment at best and a bust at worst.
Make of it what you will.
Editor's Note: ABX tests are valid and do work. Here is a link to some
ABX tests of various types of audio products. In many cases,
statistically significant differences could be discerned by
participants. In others, no differences could be discerned.
http://www.pcavtech.com/abx/abx_data.htm
. Now, of course, one can
dissect an experiment and say, well these 4 people out of 10
participants had good scores, so they could hear the differences. But,
no, you have to take all the data together. You can't just pick out
the numbers that suit your hypothesis. This would be statistically
invalid. Same thing with just looking at one music selection. With
statistical random patterns, it is likely that there will be one
selection where more participants score correctly than on other
selections. If we had enough music selections, there would likely be
one where all participants scored perfectly. But, you have to look at
all the selections together. That is the purpose of statistics. You
may remember the famous monkeys typing randomly concept. If you have
enough monkeys, eventually one of them will type all of Shakespeare's
works perfectly. To look at only that one monkey might suggest it knew
how to type Shakespeare. But, we can't do that and claim good science.
Ciao Berry
Ascoltate sempre in raffronto DIRETTO prima di acquistare.
home-theater-hifi.com
 & RadioWeblog: 
http://www.livejournal.com/users/paulberry/

 To many....
senti, trovati una cartapecchia in irlanda e non rompere più i coglioni.
-- 
        -  the sheriff® -

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Non essendo esperto del settore non saprei se al vostro gruppetto
serve più 
uno psicologo o uno psichiatra. Allucinazioni, manie di persecuzione, 
paranoie, ossessioni e psicosi varie. Ma voi Berry lo vedete proprio 
ovunque, ormai è un vero incubo. Di notte scommetto che lo sognate.
Durante 
il giorno non vedete l'ora di entrare nel ng per scovare lui o
qualcuno dei 
suoi discepoli che mina la sacralità e la purezza delle vostre
convinzioni 
ed intervenire per  punirlo. Vi rendete conto che Berry è diventata la
vostra ossessione??? Vi sta succhiando la vita e nemmeno ve ne
accorgete. 
Ragazzi, sinceramente, fossi in voi mi preoccuperei. Fate una cosa:
dite al 
vostro james bond (non ricordo il nome, siete tutti uguali) che
risalga ai 
pc di chi posta, così una volta per tutte sapremo chi e quanti si
annidano 
dietro il fantomatico Berry!!!!! Ma per cortesia....FATELO!!! Per il
vostro 
bene ed equilibrio! 
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senti, trovati una cartapecchia in irlanda e non rompere più i coglioni.


senti, trovati una cartapecchia in irlanda e non rompere più i coglioni.
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Hai ragione.
C'è gente che non vale un cazzo in giro,
e io li prendo per il culo, li infastidisco.
Questi sono il branco di "infastiditi da Berry", che fessi!
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 C'è gente che non vale un cazzo in giro
ehi...non ho detto che non vali un cazzo..!
magari mezzo sì.
-- 
        -  the sheriff® -
,