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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Jeff... posted by Henry Pasternack on December 13, 2006 at 06:15:28:
Henry, the point of Jeff's story is valid- in properly controlled testing, cues need to be accounted for. Relay clicks that are different from A to B or slight differences in timing can give false positive results (like this one). That's yet another reason why controlled experiments are so rarely done by hobbyists: it's damn hard and damn tedious to control the variables.Here's another confounding variable for polarity tests: speaker distortion. If the "out" is not the same as the "in" for a diaphragm motion, polarity reversal will be much more audible because of the change in distortion.
Have you seen Lipshitz/Vanderkooy's papers on polarity? Dick Greiner also did some fine work in that area. Their conclusions were that it can be audible, but it's a very subtle thing except on carefully chosen test signals.
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Follow Ups
- Re: Jeff... - Mahatma Kane Jeeves 06:53:50 12/13/06 (2)
- Re: Jeff... - drlowmu 08:51:27 12/13/06 (0)
- Re: Jeff... - Henry Pasternack 07:58:14 12/13/06 (0)
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