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Why DBTs in audio do not deliver (was: Finally ... The Furutech CD-do-something)
Darryl Miyaguchi wrote in message ...
For what it's worth, I have performed enough ABX testing to convince myself that it's possible for me to detect volume differences 0.5 dB using music, so I doubt very highly that a group test would fail to show that 1.75 dB differences on a variety of different music are not audible using a DBT. I think it's generally acknowledged that such differences are audible. Mirabel seems to be arguing that, given what he claims is a 1.75 dB difference, every member of Greenhill's panel should have scored at or near perfection, and the fact that they didn't bespeaks some flaw in Greenhill's methodology. I'm not yet convinced that there really was a 1.75 dB difference here, however. What Greenhill says about the 24-gauge cable is: "Its 1.8-ohm resistance resulted in a 1.76-dB insertion loss with an 8-ohm resistive load." How does this translate to the specific test in question, which used a recording of a male a cappella chorus (where the fundamental tones, at least, range from 60 to less than 1000 Hz)? Greenhill only level-matched a single pink noise test, and the only times he discusses levels in the article appear to be in reference to pink noise tests. E.g.: "A 1- to 2-dB decrease in sound level was measured for the 24-gauge wire during the pink noise listening tests." I freely admit that I'm out of my element here, but I don't think we can automatically assume that there was a similar difference in SPL when listening to the choral music. Hopefully, someone with some technical expertise can shed some further light on this. bob |
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