AlexM;689501 Wrote: > The question is how low jitter has to be before it is inaudible. Indeed it is. If the jitter is already beneath the threshold of audibility, reducing it further is a pointless exercise.
And guess what? In the two PROPERLY CONDUCTED trials of jitter audibility I am aware of (Benjamin & Gannon: Theoretical and audible effects of jitter on digital audio quality, 105th AES Convention, 1998; and Ashihara, Kiryu et al: Detection threshold for distortions due to jitter on digital audio, Acoust. Sci. & Tech. 26/1, 2005), it was shown that really quite high levels of jitter are inaudible on music signals. Benjamin & Gannon found jitter inaudible below 20nS, while Ashihara found it inaudble below 250nS. The point about these trials is that the only thing that changed was the jitter itself. Isolating this as the only variable is critical if you expect to be able to draw any conclusions as to the effects of jitter. So: CAN WE PLEASE STOP TREATING JITTER AS SOME SORT OF BOGEYMAN? There are other reasons why different bit-identical data streams may sound different through the same DAC: 1. Expectation bias on the part of the listener. This is probably the real reason in >90% of cases. 2. Noise (electrical and/or airborn) emitted by various components interfering with the analogue stages of other system components. And the complexity of this is huge - it depends on the components themselves, their relative placement, even the influence of nearby metallic objects such as equipment stands. This is a classic example of a complex system, impenetrable by reductionist analysis. Any effects noted in one system will have little or no relevance in another system. -- cliveb Transporter -> ATC SCM100A ------------------------------------------------------------------------ cliveb's Profile: http://forums.slimdevices.com/member.php?userid=348 View this thread: http://forums.slimdevices.com/showthread.php?t=91322 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
