------------------------------------------------------------------------ A poll associated with this post was created, to vote and see the results, please visit http://forums.slimdevices.com/showthread.php?t=22944 ------------------------------------------------------------------------ Question: Should there be a DIY Forum? - Yes - No - Need to think about it some more ------------------------------------------------------------------------
TimothyB Wrote: > Yeah, I was thinking about that. I could randomly swap the power and/or > RCA cables for the SB3s, so he wouldn't know which was which during the > test. If I perceive a difference I say this or that. Afterward, he says > whther is was Video A or Video B, then we figure out which SB and thus > which power supply was being used. > > Would that work for double blind? (Unless of course *he* hears an > obvious difference...) > > Would it be equivalent to have him randomly plug in the RCA and power > cables (and then leave the room) and then let me switch between the two > sources and figure out if I prefer one? > > -- Timothy One thing you might consider is an ABX or ABXY blind test. It works like this - suppose you think you can hear a difference between A and B. To test that, your friend flips a coin to choose if X=A or X=B. Then she or he plays A and B and X when you request, and you have to decide if A is X or B is X. ABXY is just the same, but where you decide if A is X and B is Y or if A is Y and B is X (slightly easier for the listener; slightly harder for the friend to keep straight!). If you can get it correctly say, 9/10 times (each trial beginning with a fresh coin flip), that's good evidence you can in fact tell the difference. I would recommend closing your eyes or turning your back so you don't see your friend, to avoid any visual cues, or even better set it up so that she or he doesn't know which SB is which. By the way, the media player foobar has a nice plugin which will set up ABXY for you automatically given, say, two audio files encoded with two different lossy formats. Rememeber - randomly choosing will be correct 50% of the time, so you really have to do at least 10 tests, and get essentially all of them right, to be confident you can hear a difference. -- opaqueice ------------------------------------------------------------------------ opaqueice's Profile: http://forums.slimdevices.com/member.php?userid=4234 View this thread: http://forums.slimdevices.com/showthread.php?t=22944 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
