"Rui Pedro Mendes Salgueiro" wrote in message
...
ludovic mirabel wrote:
I challenged:
"It would if you could quote JUST ONE such test that was done on
ANYTHING in audio, including loudspeakers, (see S. Olive's article
^^^^^^^^^^^^^^^^^^^^^^
that I quoted to begin with) that had a POSITIVE result. N.B. *
Naturally it should be controlled (preplanned methods),
statistically valid (significant numbers),randomised
( not a preselected, trained group) and truly double blind.*
Part Two:Making a good loudspeaker - imaging, space and great sound in
rooms.
By Dr. Floyd E. Toole
Vice President Acoustical Engineering
Harman International Industries, Inc.
http://www.harman.com/wp/index.jsp?articleId=121
http://www.harman.com/wp/pdf/Loudspeakers&RoomsPt2.pdf
See page 17, 18 and following pages:
"Four expensive and highly regarded loudspeakers are evaluated in
the shuffler room, in a double-blind test. These are the
measurements. The listeners, of course, do not get to see them
until it is all over."
"After several rounds of listening to different kinds of music,
several listeners yielded subjective preference ratings that were
processed in a statistical analysis program. One of the results is
a bar graph showing the average rating for the group of listeners,
for each of the loudspeakers. The tiny lines on top of the bars
show the 95% confidence intervals. If the differences in the ratings
are greater than these lines, the differences are probably
statistically significant, and not due to chance. The two top-rated
speakers are not significantly different from each other, according
to this rule. The other two are truly less good."
The test room is described at:
A New Laboratory for Evaluating Multichannel Audio Components and Systems
By Sean E. Olive, Brian Castro, and Floyd E. Toole
Harman International Industries, Inc.
http://www.harman.com/wp/index.jsp?articleId=1018
http://www.harman.com/wp/pdf/HarmanW...steningLab.pdf
--
http://www.mat.uc.pt/~rps/
.pt is Portugal| `Whom the gods love die young'-Menander (342-292 BC)
Europe | Villeneuve 50-82, Toivonen 56-86, Senna 60-94
Ludo doesn't really want this sort of information, he's been posturing for
years. If he is actually exposed to what he already knows exists, he's not
going to admit it.