lalitk wrote:
Speaking of your Synchro-Mesh reclocker, what about DAC’s internal jitter control? Is it not good enough to reduce jitter on a incoming digital signal? I am just trying to understand the need for external reclocker.
My DAC is equipped with a high resolution, low jitter clock. The measurements show Intrinsic Jitter <10 pS.
I have yet to hear a DAC that is not sensitive to incoming jitter, even those with reclocking inside. The easy way to tell is to use a cheap S/PDIF cable from a good low-jitter source and then a really good cable. If you hear ANY difference, then it is sensitive to jitter. I routinely ask my customers to do this test and 100% of the time they hear a difference. Jitter almost always matters.
Intrinsic jitter is not a good indicator either. This usually means that the internal clock jitter has this jitter specification. This has little bearing on the actual jitter you hear from your DAC. The associated circuitry and power delivery to that circuitry makes all the difference and usually increases that number 10-100 times.
I recently did jitter measurements on a device that advertised "intrinsic jitter" of less than a picosecond. The measurements at the S/PDIF termination into 75 ohms showed jitter of 60-80 psec. Lots of manufacturers say they eliminate all jitter. Not possible.
Here is some really low jitter at the 75 ohm termination inside the DAC:
http://www.audiocircle.com/index.php?topic=154310.0
Steve N.
Empirical Audio
