Quote:
Originally Posted by mattyblue  Here is an email that I received from Black Lion with a bode plot of jitter before and after clocking a 003r with their microclock.
"I've attached a few A/B Bode graphs to this email for you to look at. They are in PDF format. These were tests taken using our Audio Precision SYS-2722, which is a state of the art audio analyzer. Both of these tests measure jitter performance at the converter chip itself; one is a stock 003 using its internal clock (int003), the other is a stock 003 clocked externally to our Micro Clock (wck003). Each unit was set to 48khz sample rate, and the jitter measurement was taken between 0 and 100khz. Since jitter typically resides in the low frequency domain (about 0hz on up to approximately 1/2 the clock frequency), you'll notice the amount of jitter in each graph is highest from 0-10k, and then slopes down gradually as it approaches the upper end of the test frequency. What's most interesting to note is that the jitter performance of the 003 clocked externally (wck003) is lower than the internally clocked 003 by roughly an order of magnitude! Not only is that pretty impressive, but it pokes a rather large hole in the prevailing theory." |
It would be nice to see those same graphs zoomed in on the X-axis to only show 0hz to 10khz or 20khz and zoomed out on the Y-axis to show the full curve. It's obvious that the non modded 003 averages between 10n and 100n, but it is impossible to tell exactly how high the jitter is on the micro clock between 0hz and 200hz because the graph is zoomed in...
