Computer Audio Asylum: RE: Three good de-jittering devices in a row - by John Swenson Music servers and other computer based digital audio technologies.

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Posted by John Swenson (A ) on June 20, 2008 at 15:24:58

In Reply to: RE: Three good de-jittering devices in a row - posted by drrd on June 20, 2008 at 10:07:50:

You may actually be hearing non-jitter interactions between the computer and your system. There are at least two ways a computer can effect a system other than the data stream itself: radiated fields and power line noise.

I have a system that uses a very good clocking scheme (very low jitter clock right next to DAC chips, feeds clock to squeezebox to sync it to the DAC clock) and I can hear a difference between decoding FLAC and wav on the SB. I can measure the jitter at the DAC chip and it doesn't change, yet I hear a difference. It turns out its the radiated filds from the SB getting picked up by the analog parts of the system. I checked the filds in the vicinity of the preamp and they DO change when switching from FLAC to wav.

You might be hearing something similar, the pace car has cleaned up the jitter, so now you can clearly hear the effects of the other methods of the computer affecteng sound.

You could try things like changing the distance or orientation between the computer and the system, changing power cords on the computer, monitor etc. Computer power cords can emit a lot of stuff, changing the cord to a well shielded type can make a big difference.

See if any of that sort of thing makes any difference, if it does that might give you some hints as to what to do next.

John S.

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