mswlogo;207001 Wrote: > My understanding is it's another form of jitter and is a problem even > for single systems. > > Like I explained above in order to get rid of local jitter which can be > a problem for single system, drift then becomes a problem. > > Drift in my opinion is a bigger problem because local jitter can be > easily removed if your average clock speed matches. > > Everone that says I have a dejittering DAC should be concerned with > serious drift. I don't know how much drift is serious though. > > Having a Master common clock gets rid of Drift, you still can have > local jitter even with a common clock. But with drift removed the > jitter can be fixed up easily.
I'm afraid you are seeing problems where there don't are. Drift is nothing more than a slight offset between two tuning forks. I don't know exactly the spec of the crystal quartz used by Slimdevices, but let's assume they do it the very cheap way with a 500 ppm crystal. Reported to a regular A tuning fork, this is a maximum 0.088 Hz difference. Nobody on earth can hear such a tiny difference. And I'm pretty sure they are using more serious 10 ppm parts. Regarding jitter, ways of fixing it are not at all based upon long term accuracy of a clock. It's only a matter of an exact evaluation of the actual average clock frequency, and a smart way of matching a jitterless (yet slightly adjustable) clock to this frequency. PLL is the word. And the actual impact of the drift, from the listener point of view, is vastly overestimated: if we assume 10 ppm crystals, the timing difference at the end of a 5 mn piece of music will be in the range of 3 ms. This is the exact time difference between two listening positions 40 in. apart. So, if you are listening two synced SBs, the drift will produce no more effect than you moving 40 in. Of course, if somebody is silly enough to run two sound systems with two distinct SBs in the same 200 sqft room.... Definetely a non-issue to me. JLM -- jlmatrat ------------------------------------------------------------------------ jlmatrat's Profile: http://forums.slimdevices.com/member.php?userid=10656 View this thread: http://forums.slimdevices.com/showthread.php?t=35866 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
