fjf
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I though you all would enjoy this one. Click on Blind Tests: Matrix-Hifi
Originally Posted by fjf /img/forum/go_quote.gif I though you all would enjoy this one. Click on Blind Tests: Matrix-Hifi |
Originally Posted by fjf /img/forum/go_quote.gif It is in english. Try this one: Matrix-Hifi: Blind Tests. Open it in a new window. Weird html!. Or go here: Matrix-HiFi choose the red pill and go to blind tests. |
Originally Posted by wavoman /img/forum/go_quote.gif This is a perfectly done test. They did EXACTLY what I have been yelling about in all my posts -- they ditched the lame A/B/X question of: "which is X more like, A or B", and the asked the correct question: "which do you like better, A or B, and it is OK to say 'no difference' ". There was no X sample. Bravo!! They used "X" to mean "no preference" ... and that's perfect. Again so there is no misunderstanding -- although they wrote about ABX they did not do classic A/B/X testing (good for them!), they did the correct (IMO) test: do you prefer A to B, and no forced choice. I have read deeply in the sensory discrimination literature, and have credentials in statsitics. Trust me, these guys did it right! The question they used is the best question to eliminate repsonse bias -- better than "do you hear any difference", better than "do these sound the same", and better than "do you prefer A or B, and you must pick one", and way better than A/B/X and a number of similar tests. Again, Bravo! They did everything else right too -- no peer pressure, no rush, etc. Perfect. I accept their conclusion 100%. Let's review it. Most of us here don't put a lot of stock in high end power cords, high end RCA analog interconnects, or high-end anti-vibration platforms. This test shows that in an ordinary, even a really good ordinary system, such things do not make an audible difference for many users, even ones with good ears. They also showed that Sony makes damn good CD players, which we already knew. And that for bookshelf speakers on stands, a good power amp is as good as a great one, to coin a phrase! Of course 10 out of 38 people did pick the better system, so we can't say "the systems sound identical". We can say "the great majority of the people shouldn't spend the money on the high end system". I think we already knew that too. Sales of iPods prove it. I am sure that for some people, and some CDs, and some systems, the Wadia will sound better than the Sony -- heck it did for 10 people. The key would now be to continue the test using "play the winner". Make the 10 people come back, and see if they can do it again -- pick the high end system. In my design, some of them would be fooled (both choices would actually be the low end system). Of course one bloke might get it right over and over by dumb luck, and we want to be careful and not imbue him with special powers -- that's called the selection fallacy --but with good experimental design this can be prevented. We need to do more studies just like this one, with more play-the-winner, etc. By March 2009 I expect to have a set-up where I can do this for redbook vs 24/96 WAV files, for high-end vs low-end DACS, and some other comparisons. I'll be inviting guys from the NJ Meet over to try. Read the tests carefully -- it's all about "Do you prefer A or B, and OK to say 'no preference' ". That's the way to do listener blind testing! My hat is off to these guys. |
b.2) The sound samples will be of minimum 10 sec. duration |
Originally Posted by wavoman /img/forum/go_quote.gif Read the tests carefully -- it's all about "Do you prefer A or B, and OK to say 'no preference' ". That's the way to do listener blind testing! |
Originally Posted by XXII /img/forum/go_quote.gif Maybe I'm missing something...If they say "no preference" to one trial, what is the point of doing another trial? They took as much time as they want to come to the decision of "no preference" in the first trial; how is it possible that just by relabelling A and B they can come to a different decision?..and if they do, doesn't it mean that their decision making is flawed?? It doesn't make sense to me. Can you explain? |
Originally Posted by wavoman /img/forum/go_quote.gif ...Of course 10 out of 38 people did pick the better system... ...Make the 10 people come back, and see if they can do it again --... |