What's your candidate for the biggest bunch of audio baloney ever written or perpetrated? - Page 7 - AVS Forum
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post #181 of 183 Old 08-14-2012, 09:35 AM
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Well of course they are. Human hearing is perfect, didn't you know? wink.gif
I read that somewhere. smile.gif

If you can't explain how it works, you can't say it doesn't.—The High-End Creed

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post #182 of 183 Old 08-14-2012, 11:21 AM
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Originally Posted by krabapple View Post


Well of course they are. Human hearing is perfect, didn't you know? wink.gif

Way back when we built this device:



The most famous of the alternatives was the "Grunge Box" which added selectable amounts of even order distortion. One interesting thing is that this particular circuit adds the same amount of distortion without regard for signal level which should make it easier to pick out the distortion. If memory serves, the two lowest settings were impossible to hear with music, but could in some cases be heard with pure tones.

Of course on a THD analyzer, even the far less sophisticated devices of the day, the distortion looked huge.
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post #183 of 183 Old 08-14-2012, 11:32 AM - Thread Starter
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Originally Posted by arnyk View Post


The most famous of the alternatives was the "Grunge Box" which added selectable amounts of even order distortion. One interesting thing is that this particular circuit adds the same amount of distortion without regard for signal level which should make it easier to pick out the distortion. If memory serves, the two lowest settings were impossible to hear with music, but could in some cases be heard with pure tones.

Of course on a THD analyzer, even the far less sophisticated devices of the day, the distortion looked huge.

Yes, I remember that one from the AES article. An op-amp precision rectifier was incorporated to modify the behavior of a linear op-amp, such that the gain on the positive and negative half cycles was ever so slightly different. Very clever idea!
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