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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: I Disagree Real JJ posted by thetubeguy1954 on June 15, 2006 at 08:38:38:
Cheevers did not provide good evidence. His experiments are flawed, and leave open a whole variety of explainations even if his results are correct. He's chosen one with no real justification.Sorry, but that's how it is.
Now, straight THD *IS* in fact a "mostly useless" measurement. Where Cheevers goes astray is in not using the understanding of human hearing that was present since the 1940's in interpreting his results.
Your appeal to authority in the form of "3 professors" really is nothing more than that.
Of course, today's measurements are junk. I do believe I've said that once or 4400 or 6660 times a week, or it certainly seems like that. They are useful in that they help you diagnose what's wrong with something, if you use something more meaningful like distortion SPECTRUM rather than THD, at least.
But THD by itself, or IMD by itself, well, they are a bit useful, if they are way, way low (for a good set of test signals, not just one sine wave, please) you're in good shape.
If they are way high, it's bad.
If they are in the middle (which can be said to range from 6dB to 90dB, again using proper input signals, not single sine waves at low frequencies) you know zip until you look at the distortion spectrum.
And that's all for transparency (i.e. answering the question of "does this make an audible difference")
For things that DO make an audible difference, now you're into preference-land. What one person prefers another may not like. Some preferences (small amounts of interchannel IMD, small amounts of THD, a bit of out-of-phase low frequency noise) are fairly universal, and can be explained via understanding of the auditory system.
Other preferences are quite personal. What one person likes another may intensely dislike.
They're both right. One prefers what one prefers.
Things like PEAQ are a good ***start*** for monophonic signals.
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Follow Ups
- Sorry, but that's not how it works... - real_jj 10:55:52 06/15/06 (0)
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